The speed of a stream is 9 km/hr. A boat goes 21 km and comes back to – McqOptions

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1.	The speed of a stream is 9 km/hr. A boat goes 21 km and comes back to the starting point in 8 hours. What is the speed (in km/hr) of the boat in still water?
A.	10
B.	12
C.	8
D.	15
Answer» C. 8

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