Question
Buses A and B are moving around a circular ground of
radius 210 m. If the speeds of the buses A and B are 10 m/sec and 15 m/sec respectively, then what is the difference between the time taken by bus A and B to complete 2 round of the ground?Solution
Circumference if the ground = 2πr = 2 × 22/7 × 210 = 1320 m So, distance = 1320 m Time taken by bus A to cover 2 rounds of a ground = (1320/10) × 2 = 264 Time taken by bus B to cover 2 rounds of a ground = (1320/15) × 2 = 176 Required difference = 264 – 176 = 88
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