The speed of a stream is 3 km/hr. A boat goes 36 km and comes back to the starting point in 9 hours. What is the speed (in km/hr) of the boat in still water?

The speed of a stream is 3 km/hr. A boat goes 36 km and comes back to

1.	The speed of a stream is 3 km/hr. A boat goes 36 km and comes back to the starting point in 9 hours. What is the speed (in km/hr) of the boat in still water?
A.	8
B.	9
C.	10
D.	7
Answer» C. 10