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Start learning 50% faster. Sign in nowLet speed of boat in upstream and downstream be ‘7x’ km/h and ‘9x’ km/h respectively. 35/7x + 135/9x = 4 5/x + 15/x = 4 30 = 4x x = 15 Speed of boat in still water = (7x + 9x)/2 = 8x = 8 × 15 = 40 km/h Desired time = 180/40 = 4.5 hours
The downstream speed of a boat is 6 km/hr more than its upstream speed and the ratio of the speed of the boat in still water to the speed of the stream ...
On river, Q is the mid-point between two points P and R on the same bank of the river. A boat can go from P to Q and back in 12 hours and from P to R in...
A boy goes to school at 7 km/Hr and return at a speed of 6 km/hr. If he takes 13 hrs in all. Find the distance from his village to school?
A man travels 450 km to his home partly by train and partly by car. He takes 8 hrs 40 minutes if he travels 240 km by train and rest by car. He takes 20...
Axar covered 1/4th of the total distance at a speed of 25 km/hr. Then, he covered (1/2) of the remaining distance at a speed of 30 km/hr, and the rest o...
B and C are standing on point Q and P respectively, which are 300km apart. A starts moving to and from between Q and P at 25km/hr while A starts moving ...
A person travelled a distance of 200 km in 7 hours. He travelled partly on a car at the speed of 50 kmph and partly on cycle at 20 kmph. What is the dis...
There was a race of 2480 meters between P & Q on a circular track of 620 meters. First time they meet during the race after 4 minutes of starting of rac...
'A' can do some work alone in 16 days. 'A'and 'B' work together for 8 days after which'A' leaves and 'B' finishes the remaining work alone in 12 days. H...
