self Maths Puzzle Numerical Ability Time Distance and Speed

A boat sails downstream from point a to ponit b, which is 10 km away from a, and then returns to a. If the actual speed of the boat is 3 km/h, the trip from a to b takes 8 hours less then that of b to a. What must the actual speed of the boat for the trip from a to b to take exactly 100 minutes?

Read Solution (Total 1)

Ans= 4km/hr
Let speed of still water be s
Then according to given statement
10/(3-s) - 10/(3+s) = 8
By solving this equation
we will get s= 2 km/hr
Now we have to find actual speed of boat
so, 10/(speed of boat+2) =100/60
this gives us the speed of boat as 4 km/hr
Hence the answer is 4 km/hr
10 years agoHelpfull: Yes(1) No(0)

self Other Question

Ram and Shyam run a race of 2000m. First, Ram shyam a start of 200m and beats him by 30s. Next, Ram gives Shyam a start of 3min and is beaten by 1000m. Find the speed of the boat in still water and the speed of the river flow. A man can row 30 km upstream and 44 downstream in 10 hours. It is also known that he can row 40km upstream and 55 km downstream in 13 hours. find the speed of the man in still water.