A) 4.5 h
B) 4 h
C) 5.4 h
D) 6 h
Correct Answer: B
Solution :
Let the speed of the stream be x km/h and both the boats meet after t h According to the question, \[(12+x)t+(15-x)t=108\] ?(i) \[\Rightarrow \] \[12t+15t=108\] \[\Rightarrow \] \[27t=108\] \[\Rightarrow \] \[t=\frac{108}{27}=4\,h\]You need to login to perform this action.
You will be redirected in
3 sec