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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. 70/7x + 90/9x = 5 10/x + 10/x = 5 20 = 5x x = 4 Speed of boat in still water = (7x + 9x)/2 = 8x = 8 × 4 = 32 km/h Desired time = 200/32 = 6.25 hours
Sumit covered a distance of 1000 km in 5 hours on a bike. How much distance will he cover on a bicycle in 7 hours if he rides the bicycle at 2/5th<...
A train takes 16 seconds to pass a pole and 24 seconds to pass through a 200-meter-long tunnel. If the train overtakes a man running in the same directi...
If a person walks 20% more than of his usual speed, reaches his distance 90 minutes before. If the destination is 459 km away, then the usual speed of a...
A can complete a task in 20 days, and B can complete the same task in 25 days. If A works for 6 days and then leaves, in how many days will B complete t...
A train 200 m long passes a pole in 10 seconds. How long will it take to pass another train 300 m long running in the opposite direction at a speed of 3...
Neha and Riya start together from point P to point Q. The ratio of their speeds is 4:3. If Riya takes 30 minutes more than Neha to reach point Q, find t...
Find the distance travelled (in km) by the truck to reach point B from point A, if a car cover 45% the same distance in 2 hours 42 minutes and a truck c...
A was travelling from point X to point Y. He increased his speed by 18 km/h after every hour. He reached his destination in 20 hours. If his initial spe...
