a) 65 sec
b) 89 sec
c) 100 sec
d) 150 sec
Answer: b
Explanation:
$$\eqalign{
& {\text{Speed}} = {\frac{{240}}{{24}}} \,{\text{m/sec}} = 10\,{\text{m/sec}} \cr
& {\text{Required}}\,{\text{time}} \cr
& {\text{ = }}\, {\frac{{240 + 650}}{{10}}} \,{\text{sec}}. \cr
& = 89\,sec. \cr} $$
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