A and B take part in a 20 km bike race. A rides at the speed of 80 km per hour. A gives B a start of 2 km and still beats him by 30 minutes. The speed of B is:

20 kmph

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24 kmph

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27 kmph

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30 kmph

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32 kmph

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Solution

The correct option is B
24 kmph

Time taken by A to cover 20 km = $(\frac{20}{80})$ hr = 15 mins

$∴$ Time taken by B to cover 18 km = (15 + 30) mins = 45 mins

$∴$ B's speed = $(\frac{18}{4}) k m p h$ = 24 kmph.

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A and B take part in a 20 km bike race. A rides at the speed of 80 km per hour. A gives B a start of 2 km and still beats him by 30 minutes. The speed of B is:

The correct option is B 24 kmph Time taken by A to cover 20 km = (2080)hr = 15 mins ∴Time taken by B to cover 18 km = (15 + 30) mins = 45 mins ∴B's speed = (184)kmph = 24 kmph.

The correct option is B
24 kmph

Time taken by A to cover 20 km = $(\frac{20}{80})$ hr = 15 mins

$∴$ Time taken by B to cover 18 km = (15 + 30) mins = 45 mins

$∴$ B's speed = $(\frac{18}{4}) k m p h$ = 24 kmph.