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A boat's man goes 48 km downstream in 8 hours and returns back in 12 hours. Find the speed of the boat in still water and the rate of the stream ?
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- 5 km/hr; 1 km/hr
- 10 km/hr; 2 km/hr
- 6 km/hr; 1.5 km/hr
- None of these
Correct Option: A
Rate downstream = 48/8 = 6 km/hr
Rate upstream = 48/12 = 4 km/hr
∴ Speed of boat in still water = (6 + 4)/2 = 5 km/hr
Rate of stream = (6 -4)/2 = 1 km/hr
