Question
Buses A and B are moving around a circular ground of
radius 140 m. If the speeds of the buses A and B are 15 m/sec and 20 m/sec respectively, then what is the difference between the time taken by bus A and B to complete 3 round of the ground?Solution
Circumference if the ground = 2πr = 2 × 22/7 × 140 = 880 m So, distance = 880 m Time taken by bus A to cover 3 rounds of a ground = (880/15) × 3 = 176 Time taken by bus B to cover 3 rounds of a ground = (880/20) × 3 = 132 Required difference = 176 – 132 = 44
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