Question 1:

The speed of a boat downstream is 15 km/hr and the speed of the stream is 1.5 km/hr.
The speed of the boat upstream is?

A. 13.5 km/hr

B. 16.5 km/hr

C. 12 km/hr

Feedback Let the speed of boat in still water be x km/hr Then, x + 1.5 = 15
x = 13.5
Speed upstream = (13.5 - 1.5) km/hr = 12 km/hr

D. 8.25 km/hr

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