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 11 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 = 2Οr = 2 Γ 22/7 Γ 140 = 880 m So, distance = 880 mΒ Time taken by bus A to cover 3 rounds of a ground = (880/11) Γ 3 = 240 Time taken by bus B to cover 3 rounds of a ground = (880/20) Γ 3 = 132 Required difference = 240 β 132 = 108
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