1.

a boat goes 30km upstream and 44km downstream in 10 hrs. in 13,it can go 40km upstream and 55km downstream. determine the speed of stream and that of the boat in still water.

Answer»

Well I only got speed of stream
let speed of steam be X km
and speed of BOAT be y km
y+x=40
y=40-x
y-x=30
y=30+x
40-x=30+x
40-30=2x
10=2x
x=5km




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