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

A. 10 kmph

B. 12 kmph

C. 15 kmph

D. 22 kmph

Solution:

Relative Speed,

\begin{aligned} = \frac{Total distance}{Total time} \\ = \frac{60 + 40}{20} \\ = 5 m/s \\ = \frac{5 \times 18}{5} \\ = 18 kmph \end{aligned}

Relative Speed = (speed of ambulance - speed of school bus)
Speed of school bus = speed of ambulance - relative speed.
= 30 - 18
= 12 kmph.

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