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Arithmetic Ability
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Q.
You drive to the store at 20 kmph and return by the same route at 30 kmph. Discounting the time spent at the store, what was your average speed ?
A.
25 kmph
B.
24 kmph
C.
26 kmph
D.
22 kmph
View Answer
Correct choice: B
Explanation:
Average speed=total distance/total time Let distance to store be K then, total time =(K/20)+(K/30)=K/12 and, total time =(2K) so average speed= 2K / (K/12) = 24kmph.
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