A car travels a certain distance at 32 km/h and comes back at 68 km/h. What is the average speed for total journey?

The length of the diagonal of a square is 10 cm. What is area of this square?

If cot(A/2) = x, then x is equal to

Ajit is two times as good a workman as Badrinath and therefore is able to finish a job in 30 days less than Badrinath. Working together, they can do it in

If cos 45° - ­ sec 30° = x, then value of x is

Of the 3 numbers whose average is 64, the first number is 1/3 times the sum of other 2. The first number is

If 1/(1 + cosA) + 1/(1 ­- cosA) = x , then value of x is

In ΔPQR, S and T are points on side PQ and PR respectively. ST is parallel to QR. If S divides PQ in the ratio 4:1 and length of QR is 15 cm,what is the length of ST?