Paper 1 · Mathematical Reasoning and Aptitude
A train runs for 2 hours at 35 kmph, then 3 and a half hours at 60 kmph, and then 2 and a half hours at 70 kmph. Find its average speed.
A50 kmph
B55 kmph
C80 kmph
D56.87 kmph ✓ Correct
Correct answer: (D) 56.87 kmph — The average speed is about 56.87 kmph, so that is the answer.
Explanation
★The average speed is about 56.87 kmph, so that is the answer.
★The first part covers 2 times 35, which is 70 km.
★The second covers 3.5 times 60, which is 210 km, and the third covers 2.5 times 70, which is 175 km.
★So the total distance is 70 plus 210 plus 175, which is 455 km.
★The total time is 2 plus 3.5 plus 2.5, which is 8 hours.
★The average speed is 455 divided by 8, about 56.87 kmph.
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