If a boat is moving in upstream with velocity of 14 km/hr and goes downstream with a velocity of 40 km/hr, then what is the speed of the stream?
A. 13 km/hr
B. 26 km/hr
C. 34 km/hr
D. None of these
If a boat is moving in upstream with velocity of 14 km/hr and goes downstream with a velocity of 40 …
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A. 13 km/hr
Explanation:
Given:
Upstream speed = 14 km/hr
Downstream speed = 40 km/hr
so,
If speed of stream is y km/hr and speed of boat is x km/hr
then Upstream speed = (x – y) km/hr and downstream speed = (x + y) km/hr
Calculation:
x + y = 40 —- (i)
and x – y = 14 —- (ii)
∴ x = 27 km/hr ——— { after solving eq (i) and eq(ii)}
∴ y = speed of stream = 40 – 27 = 13 km/hr