Walking at the rate of 4 km per hour, a man covers a certain distance in 3 hours 45 minutes. If he covers the same distance on cycle, cycling at the rate of 16.5 km/hours, the time taken by him is
Speed of man = 4 km/hr and time taken = 3 hrs and 45 minutes = $$3\frac{3}{4}=\frac{15}{4}$$ hours
=> Distance = speed $$\times$$ time
= $$4\times\frac{15}{4}=15$$ km
Speed of cycling = 16.5 km/hr
=> Time taken while cycling = $$\frac{15}{16.5}=\frac{10}{11}$$ hours
= $$\frac{10}{11}\times60\approx54.55$$ minutes
=> Ans - (B)
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