Posted by **raghav** on Wednesday, June 4, 2014 at 8:02am.

A boat goes 12 km upstream and 40 km downstream in 8 hours. It can go 16 km upstream and 32 km downstream is the same time. Find the speed of the boat in still water and the speed of the stream.

- maths -
**Steve**, Wednesday, June 4, 2014 at 12:38pm
if the bot has speed b, and the stream has speed s, then since time=distance/speed,

12/(b-s) + 40/(b+s) = 8

16/(b-s) + 32/(b+s) = 8

b=6

s=2

check:

12/4 + 40/8 = 3+5 = 8

16/4 + 32/8 = 4+4 = 8

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