SSC CGL Quant – Time, Speed & Distance – Level 3 · Challenge
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It loses 16 km of running per hour = 16/80 h = 12 min.
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SSC CGL Quant – Time, Speed & Distance – Level 3 · Challenge – 8 questions, subject: Quantitative Aptitude. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.
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1.
A train passes a man standing on a platform in 9 seconds and passes the 150 m platform in 18 seconds. What is the length of the train?
Correct Answer: B [150 m]
Explanation:
L = 9v and L + 150 = 18v → v = 50/3 m/s, L = 150 m.
2.
A train passes two men walking in the same direction as the train at 3 km/h and 6 km/h in 9 s and 10 s respectively. What is the speed of the train?
Correct Answer: C [33 km/h]
Explanation:
9(v − 3) = 10(v − 6) (same length) → v = 33 km/h.
3.
A boat whose speed in still water is 15 km/h goes 36 km downstream and comes back. The stream flows at 3 km/h. How long does the round trip take?
Correct Answer: C [5 hours]
Explanation:
36/18 + 36/12 = 2 + 3 = 5 hours.
4.
Odd one outWhich of these conversions is wrong?
Correct Answer: B [63 km/h = 18 m/s]
Explanation:
63 × 5/18 = 17.5 m/s, not 18.
5.
Arrange in orderA 200 m train runs at 72 km/h. Arrange in increasing order the times it takes to cross (i) a pole, (ii) a 100 m platform, (iii) a 200 m train coming from the opposite direction at 36 km/h.
Correct Answer: A [(i) < (iii) < (ii)]
Explanation:
(i) 10 s, (ii) 15 s, (iii) 400 ÷ 30 = 13⅓ s.
6.
Data tableA car's trip: P → Q 120 km at 60 km/h; Q → R 80 km at 40 km/h; R → S 100 km at 50 km/h. What is the average speed for the whole trip?
Correct Answer: D [50 km/h]
Explanation:
Time 2 + 2 + 2 = 6 h for 300 km → 50 km/h.
7.
Two runners start together from the same point on a 400 m circular track and run in opposite directions at 6 m/s and 4 m/s. When do they meet for the first time?
Correct Answer: C [40 s]
Explanation:
Opposite directions → relative speed 10 m/s → 400/10 = 40 s.
8.
Without stoppages a train averages 80 km/h; with stoppages it averages 64 km/h. How many minutes per hour does it stop?
Correct Answer: D [12 min]
Explanation:
It loses 16 km of running per hour = 16/80 h = 12 min.
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