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Q.

In the hare - tortoise race, the hare ran for 2 min at a speed of 7.5 km/h, slept for 56 min and again ran 2 min at a speed of 7.5 km/h. The average speed of hare in the race is

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a

$7.5 km/hr$

b

$\frac{1}{2} km/hr$

c

$\frac{1}{4} km/hr$

d

$5 km/hr$

answer is C.

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Detailed Solution

Total distance travelled $2 (7.5 \times \frac{2}{60}) km = \frac{1}{2} km$

Total time $= 2 + 56 + 2 = 60 \min$

$∴$ Average speed $= \frac{s}{t} = \frac{\frac{1}{2}}{1} = \frac{1}{2} kmph$

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