Question
A salesman travels a distance of 50 km in 2 hours and 30 minutes. How much faster in kilometres per hour ,on an average , must he ravel to make such a trip in `5/6` hour less time ?
Answer: Option A
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Time required = (2 hrs 30 min - 50 min) = 1 hr 40 min. `1 2/3` hrs.
`:.` Required speed = `(50 xx 3/5)` km/hr = 30 km/hr.
Original speed = `(50 xx 2/5)` km/hr = 20 km/hr.
`:.` Difference in speed = (30 - 20) km/ hr = 10 km/hr
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