IBM
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Numerical Ability
Time Distance and Speed
If A driver drives a car four times a lap 10,20 30,60 kmph what is his average speed.
Read Solution (Total 2)
-
- For simplicity, assume the distance of the lap is 60km
When the speed is
10kmph, time taken to complete the lap=6hrs.
20kmph, time taken to complete the lao=3hrs
30kmph, time taken to complete the lap=2hrs
60kmph, time taken to complete the lap=1hr.
Average speed=total distance/time taken=240/12=20kmph - 13 years agoHelpfull: Yes(36) No(6)
- Let the lap be x km
Time taken by him to cover 4x km
=x/10 +x/20 +x/30 +x/60 hrs
=12x/60 hrs
=x/5 hrs
Therefore average speed
=4x divided by x/5
=4x*5/x
=20 kmph - 11 years agoHelpfull: Yes(33) No(1)
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