By increasing the speed of his car by 15 km/hr,a person covers 300km distance by taking an hour less than before.The original speed of the car was

If 4 men working 4 hours per day for 4 days complete 4 units of work,then how many units of work will be completed by 2 men working for 2 hours per day in 2 days?

A motor boat whose speed is 15km/hr in still water goes 30km downstream and comes back in a total of 4hr and 30 minutes.The speed of the stream is

If the roots of the quadratic equation x²-4x-log N=0 are all real,then the minimum value of N is

In a race,A B and C take part.A beats B by 30m,B beats C by 20m and A beats C by 48m.Which of the following is correct?

1.The length of the race is 300m.

2.The speeds of A,B and C are in the ratio 50:45:42

Select the correct answer using codes

Let x and y be positive integers such that x>y.The expressions 3x+2y and 2x+3y when divided by 5 leaves remainders 2 and 3 reapectively.What is the remainder when (x-y) is divided by 5?