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. MCQ with Answer and Explanation
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.
A. 75 km
B. 80 km
C. 65 km
D. 70 km
Answer: Option D
Solution (By JKSSB Mock Tests)
Upstream speed = 18 - 4 = 14 km/h. Distance covered = Upstream speed * Time = 14 * 5 = 70 km.
Explanation:
Distance 1 = 50 * 3 = 150 km. Distance 2 = 70 * 2 = 140 km. Total distance = 290 km. Total time = 5 hours. Average speed = 290 / 5 = 58 km/h.
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