Speed of a boat in still water to speed of boat in upstream is 7:5. If the boat can travel 360 km in downstream in 5 hours, then find the time taken by the boat to cover 28 km in still water.
Let speed of boat in still water and speed of boat in upstream be ‘7x’ km/h and ‘5x’ km/h, respectively. Speed of stream = 7x – 5x = 2x km/h Speed of boat in downstream = 7x + 2x = 9x km/h So, 9x = 360/5 = 72 Or, x = 8 Speed of boat in still water = 7 × 8 = 56 km/h Desired time = 28/56 = 30 minutes
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<...
Arijit, Benny, and Chetna together can complete a work in 12 days. If the ratio of the efficiency of Arijit, Benny, and Chetna is 8:5:6, respectively, t...
A train moving at 3/5th of its normal speed reaches its destination 10 hours late. Find the normal time taken by it.
The ratio of the speed of car to that of a train is 15:22. If the speed of the train is 35 Km/hr more than that of the car, what is the speed of the car?
Two cars X and Y start from two places A and B respectively which are 700 km apart at 9 a.m. Both the cars run at an average speed of 60 km/hr towards e...
‘A’ and ‘B’ started moving towards each other at same time with a speed of 25 km/hr and 20 km/hr, respectively. If the di...
‘A’ and ‘B’ started moving towards each other at same time with a speed of 15 km/hr and 10 km/hr, respectively. If the di...
The average speed of a car, a bus and a train together is 117 km/hr. andn ratio of their speed is 2 :4: 7. What is the average speed of a train and the ...
An Aeroplane flies along a Square field @ 50, 100, 200 and 400 km/hours respectively. Then find the Average speed of the aeroplane during the whole jour...
