A motorboat maps 32 km downstream in 2 hours and tracks the same upriver stretch upstream in 4 hours. Find the baseline speed of the boat hull in still water. MCQ with Answer and Explanation
A motorboat maps 32 km downstream in 2 hours and tracks the same upriver stretch upstream in 4 hours. Find the baseline speed of the boat hull in still water.
A. 12 km/h
B. 15 km/h
C. 14 km/h
D. 10 km/h
Answer: Option A
Solution (By JKSSB Mock Tests)
Downstream speed = 32 / 2 = 16 km/h. Upstream speed = 32 / 4 = 8 km/h. Speed in still water = (16 + 8) / 2 = 12 km/h.
Explanation:
New speed = 5/6 of usual speed => New time = 6/5 of usual time. Difference = 1/5 of usual time = 10 minutes. Typical baseline time = 10 * 5 = 50 minutes.
A field surveyor walking at 4 km/h handles a regular sector. If he steps up to run at 8 km/h, he takes 30 minutes less across the course stretch. Find the absolute distance profile.
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