ABC26GN3801 · Boats and Streams
Subject: General Aptitude · Chapter: Boats and Streams · Exam: · Marks: · Difficulty:
A boatman rows to a place 45 km distant and back in 20 stream in the same time as 4 km against the stream. Fi
Answer
Explanation
Suppose he moves 12 km downstream in x hours. Then, 12 Speed downstream = km/hr, Speed upstream = km/hr x 45 45 x x 20 4 x 4 4 \ + = 20 ⇒ + = = ⇒ = ⇒ x= . (12/x ) (4/x ) 12 4 45 9 3 9 3 3 So, Speed downstream = 12 × km/hr = 9 km/hr, 4 3 Speed upstream = 4 × km/hr = 3 km/hr. 4 1 \ Speed of the stream = (9 – 3) km/hr = 3 km/hr. 2
Explanation as extracted from the printed page; notation may be imperfect.
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