Pipe P can fill and empty tank in 4 hours but pipe Q can completely empty the same tank in 8 hours. But the pipes were opened alternately after every two hours starting with pipe P then in how many hours, the tank was completely filled ?

The average age of A, B And C sis 30 years. If the difference between B's age and A's age is same as the diffe...

The humidity of air measured in percentage is called -

Kalam has three daughters; Shaila , Meena and Tina. Three years ago, when Kalam was twice as old as Tina , he...

In a garden , there are 10 rows and 12 columns of mango trees. The distance between two trees is 2 meters and...

Due to reduction in the bus price by 15% , the number of passengers on a certain route increased by 40% . What...

Hassan completed 1/3 portion of a job in 8 days and left. Then Jashim was recruited and he worked for 5 days a...