जॉइन Examsbookउत्तर : 4. "1/2 kmph"
A boatman can row 3 km against the stream in 20 minutes and return in 18 minutes. Find the rate of current ?5
प्र: A boatman can row 3 km against the stream in 20 minutes and return in 18 minutes. Find the rate of current ?
- 11/3 kmphfalse
- 22/3 kmphfalse
- 31/4 kmphfalse
- 41/2 kmphtrue
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उत्तर : 4. "1/2 kmph"
व्याख्या :
Answer: D) 1/2 kmph Explanation: Speed in upstream = Distance / Time = 3 x 60/20 = 9 km/hr. Speed in downstream = 3 x 60/18 = 10 km/hr Rate of current = (10-9)/2 = 1/2 km/hr.