Speed, distance and time is the chapter most aspirants believe they have finished, and then lose marks on in the hall - usually because a train crossing a platform got read as a train crossing a pole, or because the return journey was averaged by adding two speeds and halving them. In SSC CGL Tier-1 the Quantitative Aptitude section gives you 25 questions behind a 15-minute sectional lock, so a sum you solve correctly in three minutes has still cost you the section. What separates a scorer here is not knowing the formula - everyone knows distance equals speed into time - but seeing instantly that speed and time are inversely proportional when distance is fixed, and turning the whole question into a ratio. This page gives you real previous-year SSC questions on the topic with the commission's own answer keys, and the handful of habits that make most of them one-line work.
Speed, distance and time sits inside Quantitative Aptitude in CGL Tier-1, where the whole section is 25 questions for 50 marks with a 15-minute sectional timer, +2 for a correct answer and -0.50 for a wrong one. SSC's official quant syllabus lists 'Time and Distance' and 'Time and Work' as separate heads, and the topic also feeds trains, boats and streams, and relative-speed variants. How many of the 25 questions come from this chapter changes from shift to shift - in past papers it has usually been a question or two rather than a block, so treat it as a reliable small earner, not a section by itself. In Tier-2 Paper-1, Mathematical Abilities is a 30-question module worth 90 marks where the same chapter reappears with longer, multi-step framing.
The chapter is one idea wearing six costumes: a train crossing a pole, a train crossing a platform, two trains crossing each other, a boat in a stream, a man on an escalator, and two people meeting or overtaking. The formula never changes - what changes is which length you add and which speed you add or subtract. Our topic sets walk through all six, drawn from real SSC CGL, CHSL and MTS papers, so you meet each costume before the exam does.
When distance is constant, speed and time are inversely proportional - that single line solves most SSC questions of the 'if he walks at 5 km/h he is late by 10 minutes, at 6 km/h he is early by 5' type without ever writing a full equation. We flag the questions in the bank where the ratio route exists and show the solution both ways, the long way and the ratio way, so you can see the thirty seconds you just saved rather than being told about them.
After a mock, the AI separates a speed-distance-time error you made because you added the platform length wrongly (conceptual) from one where the relative speed was right and the unit conversion from km/h to m/s was not (calculation), from one you rushed in the last ninety seconds of the sectional timer (time-pressure). That distinction matters: three of those need different fixes, and only one of them needs you to reread the chapter.
SSC does not let you borrow time from English to finish quant - each section is locked at 15 minutes. Our mocks reproduce that lock exactly, which is the only honest way to find out whether your speed-distance-time solving survives a clock. Most aspirants discover the chapter is not their problem; pacing is. The per-question timing report shows you which STD questions you should have left alone and which you abandoned too early.
Convert the question into a ratio before you reach for a formula. If the distance is the same in both cases, speed and time are inversely proportional, so a speed ratio of 5:6 means a time ratio of 6:5, and the difference between those parts equals the given time gap. Memorise the km/h to m/s conversion as multiply by 5/18 so you never lose a second on it. Most SSC questions from this chapter are built on exactly one of these two moves.
A train crossing a pole, a man or any point object covers only its own length. A train crossing a platform, a bridge or a tunnel covers its own length plus the length of that object. When two trains cross each other, add both lengths, and add their speeds if they move in opposite directions or subtract them if they move in the same direction. Nearly every train error in SSC papers comes from getting one of those three additions wrong, not from the arithmetic.
Because you spend more time at the slower speed, so the slower speed carries more weight. When the same distance is covered at speeds a and b, the average speed is 2ab/(a+b), the harmonic mean, not (a+b)/2. SSC sets this trap regularly with 'goes at 40 km/h and returns at 60 km/h' questions, where the wrong answer 50 is always sitting in the options waiting for you. If instead the two speeds are held for equal times, then the plain average is correct - read which one the question fixed.
Mostly, yes. Our question bank holds roughly 31,000 questions, of which about 29,000 are genuine previous-year SSC questions carrying the commission's own official answer keys, taken from CGL, CHSL, MTS and other SSC papers. That matters for a chapter like this one, because coaching-written speed and distance sums tend to be harder and longer than what SSC actually asks, which trains you for the wrong exam.
Aim for under 45 seconds on a standard one and under 75 on a multi-step boats-and-streams or two-trains question. With 25 questions in a 15-minute locked section, your overall budget is about 36 seconds per question, and you simply cannot fund a three-minute sum from that. If a question has not opened up within the first twenty seconds of reading it, mark it and move - the -0.50 penalty is not the expensive part, the four easy questions you never reached are.
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