A) 46 km/h
B) 6 km/h
C) 7 km/h
D) 5 km/h
Correct Answer: D
Solution :
[d] Let the speed of the stream be x km/h. Then, upstream speed = (15 ? x) km/h. and downstream speed = (15 + x) km/h. Now, \[\frac{30}{(15+x)}+\frac{30}{(15-x)}=4.5\] Checking with options, we find that x = 5 km/h.You need to login to perform this action.
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