For the following questions answer them individually
One tap can fill an empty cistern in 2 hours and another tap can empty the same filled cistern in 3 hours. The time taken to fill the cistern if both the taps are opened, is :
In how many different ways can the letters of the word THERAPY be arranged so that the vowels never come together ?
In the four consecutive prime numbers that are in ascending order, the product of first three is 385 and that of last three is 1001. The largest prime number is :
The sum of the present ages of father and son is 90 years. 10 years earlier, the ratio of their ages was 5:2. The present age of the father is :