Bank test Exam Numerical Ability Time Distance and Speed

Driver of an ambulance sees a school bus 60km ahead of him.After 30sec the school bus is 90kmbehind.If the speed of the ambulance is 38kmph,then What is the speed of school bus?

Read Solution (Total 1)

total distance =60+90=150
relative speed=total distance /time
=150/30
=5*18/5=18kmph
Relative Speed = (speed of ambulance - speed of school bus)
Speed of school bus = speed of ambulance - relative speed.
= 38kmph-18kmph=20kmph
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