a) 5 second
b) 7.5 second
c) 10 second
d) 15 second
Answer: b
Explanation:
$$\eqalign{
& {\text{Speed = 132 km/hr }} \cr
& {\text{ = 132}} \times \frac{5}{{18}}{\text{m/sec}} \cr
& {\text{ = }}\frac{{110}}{3}m/\sec \cr
& T = \frac{D}{S} \cr
& \,\,\,\,\,\, = \frac{{110 + 165}}{{\frac{{100}}{3}}} \cr
& \,\,\,\,\,\, = \frac{{3\left( {275} \right)}}{{110}} \cr
& \,\,\,\,\,\, = 7.5\sec \cr} $$
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