Answers

2014-04-04T10:37:13+05:30
Boat speed =x km/h
stream speed = y km/h
speed upstream is = (30+40)/(10+13) = 3.04
speed downstream = (44+55)/(10+13) = 4.30
so boat speed in still water = 1/2(3.04+4.30) = 3.67 km/h
and stream speed is  = 1/2(4.30-3.04) = 0.63 km/h




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2014-04-04T19:08:32+05:30
A boat goes 30km upstream and 44km downstream in 10 hours
0.63km/hour
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