Elitmus Exam Numerical Ability Ratio and Proportion

A covers a circular track in 15 mins while B does so in 25mins. In how much time will A and B together again? They start running in the same direction from the same point?

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Elitmus Other Question

'P' is a 3 digit number. First digit from the left is a square of the last digit. None of the digit is repeated in 'P'. How many number of Primesubdents are possible. (Primesubdent is a number that can not be divided by 2,3,5)
a)6
b)
c)
d)72
Assume that the distance that a car runs on 1 litre of petrol varies inversely as the square of the speed at which it is given. It gives a run of 25 km per litre at a speed of 36 km pH.At wat speed should it be driven to get a run of 36 km per litre?