in a 100 m race, A runs at 8 kmph. If A gives B a start of 4 m and still beats him by 15 seconds, what is the speed of B?
Detailed Explanation:
A's speed = 8 kmph = 8 × (5/18) = 20/9 m/s. A covers 100 m in 100 ÷ (20/9) = 45 seconds.
B gets a 4 m head start, so B runs only 96 m. A beats B by 15 seconds, meaning B takes 45 + 15 = 60 seconds to cover 96 m.
B's speed = 96/60 = 1.6 m/s = 1.6 × (18/5) = 5.76 kmph.
Therefore, Option 2 (5.76 kmph) is the correct answer.
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