A motorboat rows 24 km downstream in 3 hours and tracks the identical route upstream back to the jetty point in 4 hours. Find the net speed index of the current stream flow. MCQ with Answer and Explanation
A motorboat rows 24 km downstream in 3 hours and tracks the identical route upstream back to the jetty point in 4 hours. Find the net speed index of the current stream flow.
A. 1.5 km/h
B. 1.0 km/h
C. 0.8 km/h
D. 1.2 km/h
Answer: Option B
Solution (By JKSSB Mock Tests)
Downstream speed = 24 / 3 = 8 km/h. Upstream speed = 24 / 4 = 6 km/h. Speed of current stream flow = (8 - 6) / 2 = 2 / 2 = 1.0 km/h.
A modern speedboat records a speed of 18 km/h in still water. It spans a specific upstream reach in 5 hours. If the current velocity is 4 km/h, find the reach distance.
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