Paper 1 · Mathematical Reasoning and Aptitude
A man on tour travels the first 320 km at 64 kmph and the rest at 80 kmph. The average speed for the entire 640 km is
A35.55 kmph
B36 kmph
C71.11 kmph ✓ Correct
D71 kmph
Correct answer: (C) 71.11 kmph — The average speed is 71.11 kmph, so that is the answer.
Explanation
★The average speed is 71.11 kmph, so that is the answer.
★The first 320 km at 64 kmph takes 320 divided by 64, which is 5 hours.
★The next 320 km at 80 kmph takes 320 divided by 80, which is 4 hours.
★So the total time for 640 km is 5 plus 4, which is 9 hours.
★Average speed is total distance over total time, that is 640 divided by 9.
★This is about 71.11 kmph.
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