state gov BHU Junior Clerk 2025 Mock Test Series Quantitative Aptitude Speed Time and Distance Boat and River
A motor boat whose speed is 15 km / hr in still water goes 30 km downstream and comes back in a total of four hours and 30 minutes . What is the speed of the stream in km / hr ?
1
4 km / hr
2
5 km / hr
3
6 km / hr
4
10 km / hr