The driver of an ambulance sees a college bus 40 m ahead of him after 20 seconds the college bus is ...........

Quantitative Aptitude ( CCS) Time & distance

The driver of an ambulance sees a college bus 40 m ahead of him after 20 seconds, the college bus is 60 meter behind. If the speed of the ambulance is 30 km/h, what is the speed of the college bus?

10 kmph

12 kmph

15 kmph

22 kmph

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Explanation:

Relative Speed = (Total distance)/total time
= (60+40) /20 = 5 m/s = (5*18)/5 = 18 kmph
Relative Speed = (speed of ambulance – speed of College bus)
Speed of College bus = speed of ambulance – relative speed.
= 30-18 = 12 kmph.