जॉइन Examsbookउत्तर : 3. "1.5 kmph"
A man swims downstream 72 km and upstream 45 km taking 9 hours each time; what is the speed of the current ?5
प्र: A man swims downstream 72 km and upstream 45 km taking 9 hours each time; what is the speed of the current ?
- 11 kmphfalse
- 23.2 kmphfalse
- 31.5 kmphtrue
- 42 kmphfalse
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उत्तर : 3. "1.5 kmph"
व्याख्या :
Answer: C) 1.5 kmph Explanation: 72 --- 9 ? ---- 1 => Down Stream = 8 45 ---- 9 ? ---- 1 => Up Stream = 5 Speed od current S = ? S = (8 - 5)/2 = 1.5 kmph.