The average speed of a train is 20% less on the return journey than on the onward journey. The train halts for an hour at the destination station before starting on the return journey. If the total time taken for the to and from  journey is 46 hrs, covering a distance of 2000 km, the speed of the train on the return journey is:

In a school with 600 students the average age of the boys is 12 years and that of the girl is 11 years. If he average age of the students is 11 years 9 months, then the number of girls in the school is

If tan⁴θ + tan²θ = 1, then the value of cos⁴θ + cos²θ is

A tank of 30 meter long, 20metre wide and 12 meter deep is dug in a rectangular field of length 588 meter and breadth 50 meter. The earth sand so dug out is spread evenly on the remaining part of the field. The height of the field raised by it is

In how many years a sum of Rs. 3000 will yield an interest of Rs. 1080 at 12% per annum simple interest?

A train travelling at a constant speed crosses a pole in 12 seconds whereas cross a tunnel 198 metre long in 30 seconds. Find the length of train.

A circle touches a quadrilateral ABCD. Find the true statement: -