a) 15.4 kmph
b) 14 kmph
c) 14.5 kmph
d) 14.4 kmph
Answer: d
Explanation:
$$\eqalign{
& {\text{Time taken by Kamal}} \cr
& = \frac{{100}}{{ {\frac{{18 \times 5}}{{18}}} }} \cr
& = 20\,{\text{seconds}} \cr
& {\text{Hence, }} \cr
& {\text{Time taken by Bimal}} \cr
& 20 + 5 = 25\,{\text{seconds}} \cr
& {\text{So, Bimal’s speed}} \cr
& = \frac{{100}}{{25}} \cr
& = 4\ \cr
& = \frac{{4 \times 18}}{5} \cr
& = 14.4\,{\text{kmph}} \cr} $$
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