Subject
Quantitative Aptitude
Topic
Speed & Distance
A man rows to a place 48 km distant and come back in 14 hours. He finds that he can row 4 km with the stream in the same time as 3 km against the stream. The rate of the stream is:
A man rows to a place 48 km distant and come back in 14 hours. He finds that he can row 4 km with the stream in the same time as 3 km against the stream. The rate of the stream is:
ক)
1 km/hrখ)
1.5 km/hrগ)
2 km/hrঘ)
2.5 km/hrExplanation
Suppose he move 4 km downstream in x hours. Then, Speed downstream = (4/x) km/hr. Speed upstream = (3/x) km/hr So, 48/(4/x) + 48/(3/x) = 14 or x = ½ So, Speed downstream = 8 km/hr, speed upstream =6 km/hr. Rate of the stream = ½(8-6) km/hr = 1 km/hr.Related questions
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