A racing car going at an average speed of 108 km/ hr takes 15 minutes to complete a lap on a racing track. By how much should it increase its speed (in km/hr) to complete the lap in 12 minutes?

Two trains 108 m and 112 m in length are running towards each other on the parallel lines at a speed of 45 km/hr and 54 km/hr respectively. To cross each other after they meet, it will take

In the given figure ABCD is a Parallelogram then the find out of the value of x is?

Directions:Study the following table carefully to answer these questions:

Percentage of Marks obtained by six students in six subjects

What are the average marks obtained by all students in Chemistry?

Find out the H.C.F of 306, 204 and 136.

An alloy contains zinc, copper and tin in the ratio 2:3:1 and an other contains copper, tin and lead in the ratio 5:4:3. If equal weights of both alloys are melted together to form a third alloy, then the weight of lead per kg in the new alloy will be.

Find compound interest on Rs. 50000 at 12 % per annum for 6 months, compounded quarterly. 

A and B can separately complete a piece of work in 20 days and 30 days respectively. They worked together for some time then B left the work. If A completed the rest of the work in 10 days, then B worked for how many days?