Subject
Quantitative Aptitude
Topic
Speed & Distance
In a stream running at 2 km/h a racing boat goes 32 km upstream and back again to the starting point in 12 hours. Find the speed of the racing boat in still water.
In a stream running at 2 km/h a racing boat goes 32 km upstream and back again to the starting point in 12 hours. Find the speed of the racing boat in still water.
ক)
6 km/hখ)
8 km/hগ)
10 km/hঘ)
11 km/hঙ)
None of theseExplanation
Let speed of boat in still water = a km/hr Then, Speed of boat in Upstream = a - 2 km/hr Speed of boat in downstream = a+2 km/hr Then we have ⇒ (32 × 2a) / (a 2 – 4) = 12 16a = 3a 2 - 12 On solving, we get a = 6 Hence, speed of racing boat in still water is 6 km/hrRelated questions
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