Quantitative Aptitude Ques 83
Question: A man rows 12 km in 5 h against the stream, the speed of current being 4 km/h. What time will be taken by him to row 15 km with the stream?
Options:
A) $ 1,h26\frac{7}{13}\min $
B) $ 1,h25\frac{7}{13}\min $
C) $ 1,h24\frac{7}{13}\min $
D) $ 1,h27\frac{7}{13}\min $
Show Answer
Answer:
Correct Answer: A
Solution:
- Let the speed of boat be x km/h, Speed of upstream be $ (x-4)km/h. $ According to the question, $ \frac{12}{x-4}=5 $
$ \Rightarrow $ $ 12=5x-20 $
$ \Rightarrow $ $ x=\frac{32}{5}km/h $
$ \therefore $ Time taken to row 15 km with the stream $ =\frac{15}{\frac{32}{5}+4}=\frac{15\times 5}{52}=\frac{75}{52} $ $ =1\frac{23}{52}\times 60=1,h26\frac{7}{13}\min $
BETA
