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The speed of a boat in still water is 5 km/hr, it can go 30km upstream and return downstream to the original point in 4 hours 30 min. The speed of the stream is_______?

/ Basic Maths Mcqs, Boats and Streams, Mathematics Mcqs / By
The speed of a boat in still water is 5 km/hr, it can go 30km upstream and return downstream to the original point in 4 hours 30 min. The speed of the stream is_______?

A. 5km/hr
B. 8 km/hr
C. 10 km/hr
D. 15 km/hr