Question 30

A man riding a bicycle, completes one lap of a circular field along its circumferences at the speed of 14.4 km/h in 1 min 28 s. What is the area of the field?

Solution

Distance travelled in 1min 28 sec = Speed *time
Speed = 14.4km/hr = 14.4*5/18 m/s = 4m/s
Distance = 4*88 = 352

$$2\pi r = 352$$
r = 56

Area =$$\pi r^2$$ = 22*56*56/7 = 9856

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