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Q.

Two persons A and B each of mass 80 kg are carrying loads 25kg each. If they reach the top of a building of height 20 m in 10 S and 30 S respectively, the ratio of their efficiencies Is

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a

2 :1

b

3 :1

c

1 :3

d

1 :2

answer is B.

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Detailed Solution

$η = \frac{\frac{O}{P} p o w e r}{\frac{I}{P} p o w e r} \times 100$

$\frac{η_{1}}{η_{2}} = \frac{t_{2}}{t_{1}} = \frac{30}{10} = \frac{3}{1}$

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