a) 4.45 km/hr
b) 4.14 km/hr
c) 4.15 km/hr
d) 4.25 km/hr
Answer: b
Explanation: A’s speed = 5 km/hr
= $$\left( {5 \times \frac{5}{{18}}} \right)$$ m/sec
= $$\frac{25}{18}$$ m/sec
Time taken by A to cover 100 metres
= $$\left( {100 \times \frac{{18}}{{25}}} \right)$$
= 72 sec
Time taken by B to cover 92 metres
= (72 + 8) sec
= 80 sec
B’s speed
$$\frac{92}{80}$$ m/sec
= $$\left( {\frac{{92}}{{80}} \times \frac{{18}}{5}} \right)$$ km/hr
= $$\frac{414}{100}$$ km/hr
= 4.14 km/hr
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