Question

A boat goes 30km upstream and 44 km downstream in 10 hours . In 13 hours,it can go 40 km upstream and 55 km down-stream. Determine the speed of the stream and that of the boat in still water ....any 1 wants 2 become brilliant. PLZZ solve this right now

Answer 1

Now, 30u+44v=10

 ⇒ 30u+44*1/11=10

 ⇒ 30u= 10-4

 ⇒ u= 6/30

 ⇒ u=1/5

Now, 1/x-y= u

 ⇒ 1/x-y=5

 ⇒ x-y=5

 ⇒ x= 5+y ---- (7)

Now, v= 1/x+y

 ⇒ 1/11= 1/x+y

 ⇒ x+y=11 --- (8)

 ⇒ 5+y+y=11 (from 7)

 ⇒ 2y= 6

 ⇒ y= 3

Also x = 5+y

 ⇒ x = 5+3

x = 8

Therefore speed of boat is x km/h or 8km/h and speed of still water is y km/h or 3km/h.

Answer 2

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