Question

If 1hour 30minute is taken for 20 sums then how many minutes are taken for 1 sum

Answer 1

Time taken for 20 sums = 90 mins

Therefore time taken for 1 sum = (90 / 20) mins = 4.5 mins

here is your answer.

Answer 2

1 hour 30 minute =90 minutes.
So, time taken for 20 sums = 90 minutes.
so, time taken for 1 sum= 90/20 minutes = 4 minutes 30 seconds....
Hope it helps you....