a) 10 kmph
b) 12 kmph
c) 15 kmph
d) 22 kmph
Answer: b
Explanation: Relative Speed,
$$\eqalign{
& = \frac{{{\text{Total }}\,{\text{distance}}}}{{{\text{Total time}}}} \cr
& = \frac{{60 + 40}}{{20}} \cr
& = 5\,\,{\text{m/s}} \cr
& = \frac{{5 \times 18}}{5} \cr
& = 18\,\,{\text{kmph}} \cr} $$
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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