Question
A man travelled from the village to the post -office at the rate of 25 kmph and walked back at the rate of 4 kmph . If the whole journey took 5 hours 48 minutes . Find the distance of the post-office from the village.
Answer: Option C
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Average speed = `((2xy)/(x + y))` km/hr = `((2 xx 25 xx 4)/(25 + 4))` km/hr = `200/29`km/hr.
Distance travelled in 5 hours 48 minutes i.e. `5 4/5` hrs. = `(200/29 xx 29/5)` km = 40 m.
`:.` Distance of the post-office from the village= `40/2` = 20 km.
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