Subject
Quantitative Aptitude
Topic
Speed & Distance
A boat covers a certain distance downstream in 1 hour, while it comes back in 1.5 hour. If the speed of the stream be 3 km/hr, what is the speed of the boat in still water?
A boat covers a certain distance downstream in 1 hour, while it comes back in 1.5 hour. If the speed of the stream be 3 km/hr, what is the speed of the boat in still water?
ক)
12 km/hrখ)
9.5 km/hrগ)
14 km/hrঘ)
7.5 km/hrঙ)
None of theseExplanation
Let the speed of the boat in still water be x km/hr Speed downstream = (x + 3) km/hr Speed upstream = (x − 3) km/hr Distance of downstream = Distance of Upstream ∴ (x + 3) × 1 = (x − 3) × 1.5 ⇒ x + 3 = 1.5x – 4.5 ⇒ 0.5x = 7.5 km/hr ⇒ x = 15 km/hrRelated questions
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