The speed of a boat in still water is 30 km/hr. If the boat covers 180 km in upstream in 12 hours, then find the time taken by the boat to travel 180 km in downstream.
Let the speed of the boat in still water and the speed of the current be ‘x’ km/hr and ‘y’ km/hr, respectively Upstream speed of the boat = (x – y) = 180/12 = 15 km/hr Or, 30 – y = 15 Or, y = 30 – 15 = 15 km/hr Therefore, downstream speed of the boat = 30 + 15 = 45 km/hr Required time taken = 180/45 = 4 hours
Howrah Express is scheduled to reach Howrah at 8:00 am, but due to the high number of trains the train couldn't get clearance for platform, and it got s...
A person covers a certain distance at a certain speed. If he increases his speed by 40%, then he takes 15 minutes less to cover the same distance. Find ...
A and B are travelling towards each other with a speed of 15 km/hr and 25 km/hr. They started at same time and A covered 30 km less distance than B befo...
A motor-cycle covers 160 km with a speed of 70 km/hr. find the speed of the motor-cycle for the next 170 km journey so that the average speed of the who...
A train covers a certain distance at a speed of 48 km/h and the next same distance with a speed of 60 km/h and the next same distance with a speed of 80...
Amit walks for 2 hours at a speed of 's' km/hr, and then his speed increases by 25 km/hr, covering the remaining distance in 3 hours. If Amit's speed ha...
Three cities A, B, and C are located such that they form the vertices of an equilateral triangle if joined by straight lines. Prasanna travels from A t...
In a 1000-metre race, 'Ravi' beats 'Shyam' by '200' metres and 'Raj' by '300' metres. If 'Shyam' and 'Raj' participate in a 400-metre race, and 'Raj' ge...
A biker travels first half of his journey with a speed of 18 km/h and the other half with a speed of 'x' km/h. If the total distance traveled by him is ...
A car travels at 60 km/h to reach its destination on time. If it travels at 65 km/h, it will reach the destination 30 minutes ear...
