Question Bank » Aptitude » Boats-And-Streams

Q
A man can row 7½ kmph in still water. If in a river running at 1.5 km an hour it takes him 50 minutes to row to a place and back, how far off is the place     (R.R.B. 2002)
 
A) 8 km
B) 3 km
C) 10 km
D) 15 km
Explanation:

Speed downstream = (7.5 + 1.5) kmph = 9 kmph;  
Speed upstream = (7.5 – 1.5) kmph = 6 kmph.  
Let the required distance be x km. Then,  
 
Hence, the required distance is 3 km  

facebook
twitter
google plus
linkedin
pinterest

Enter your E-Mail to receive updates