Subject: General Aptitude · Chapter: Boats and Streams · Exam: 2009 · Marks: · Difficulty:
A man can swim in still water at a rate of 4 km/ hr. The width of the river is 1 km..How long will he take to cross the river straight, if the speed of the current is 3 km/hr?
(a)10 min
(b)15 min
(c)18 min
(d)20 min
Answer
Answer (as printed): B
Explanation
Required time = Time taken to cover 1 km @ 4 kmph $$=\left(\frac{1}{4} \times 60\right) \min =15 \min .$$
Explanation as extracted from the printed page; notation may be imperfect.