self Maths Puzzle

A leak a tank can empty the tank in 20 hr. The leak is at 3/4th of the hight from the leak to filling pipes there which can fill the tank in 6 hr and 12 hr. If both the pipes are opend in how many hr the tank will be filled

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self Other Question

A person X has four notes of rupee 1, 2, 5 and 10 denomination. The number of differnt sums of money she can from them is Every day a boy on his way to go school and meets a train in railway crossing. one day the boy was late by 25 mint and he mate the train 6 km before the railway crossing. if the speed of the boy is 12km/hr. find the speed of the train?