If `4/5` of a water tank is filled in 1 hour, how much time will be required to fill the rest of it?
(a)20 minutes
(b) 15 minutes
(c)12 minutes
(d) 10 minutes

A bacterial cell divides once every minute and takes an hour to fill a cup. How much time will it take to fill half the cup ? (a) 60 minutes (b) 59 minutes (c) 30 minutes (d) 15 minutes

Bacterial cell divides every one minute. It takes 15 minutes a cup to be one-fourth full. How much time will it take to fill the cup ? (a) 30 minutes (b) 45 minutes (c) 60 minutes (d) 17 minutes

A person is to count 4500 currency notes. Let a_n , denote the number of notes he counts in the nth minute if a_1=a_2=a_3=..........=a_10=150 and a_10,a_11,......... are in an AP with common difference -2 , then the time taken by him to count all notes is :- (1) 24 minutes 10 11 (2) 34 minutes (3) 125 minutes (4) 135 minutes

Find the ratio of : 5 hours and 50 minutes to 8 hours and 10 minutes.

A car covers 150 km in 3 hours. How much distance would the car cover in 12 minutes?

Find the ratio of each of the in simplest form : 2 hours 45 minutes to 1 hour 15 minutes

A bacterium divides in every 20 minutes. How many bacteria will be formed within three hours?

Sahil covers 5 km in 50 minutes. How much distance will he cover in 150 minutes ?

A river 3 m deep and 40 m wide is flowing at the rate of 2 km per hour. How much water will fall into the sea in a minute?

6 pipes are required to fill a tank in 1 hour 20 minutes. How long will it take if only 5 pipes of the same type are used?