Question
A car running with a speed of ‘x’ m/sec makes 7
rounds of a circular field having radius 21 metres, in 12 seconds. Find the time taken by car to cover 228 metres with the speed of (x – 20) m/sec.Solution
Distance covered by the car = 7 × 2πr = 2 × (22/7) × 21 × 7 = 924 metres Speed of the car = 924/12 = 77 m/sec Required time taken = 228/(x – 20) = 228/57 = 4 seconds
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