A motor boat takes 2 hours to travel a distance of 9 km downstream and it takes 6 hours to travel the same distance against the current. The speed of the boat in still water and that of the current (in km/h) respectively are:
A. 6, 5 km/h
B. 3, 1.5 km/h
C. 8, 5 km/h
D. 9, 3 km/h
Answer: Option B
Solution (By Examveda Team)
Downstream speed, = $$\frac{9}{2}$$ = 4.5 kmph Upstream speed,= $$\frac{9}{6}$$ = 1.5 kmph Thus, speed of boat in still water, = $$\frac{{4.5 + 1.5}}{2}$$ = 3 km/h Speed of current = $$\frac{{4.5 - 1.5}}{2}$$ = 1.5 km/hThis Question Belongs to Arithmetic Ability >> Speed Time And Distance
A and B are 300 km apart, Mohit starts from city A at 8:24 am and an hour later Rohit starts from City A & after travelling for one hour he reaches at city C that Mohit had passed 40 min earlier.both Mohit and Rohit reaches city B at same time.find the speed of both.