Train Passes by a lamp post at platform in 7 sec. and passes by the platform completely in 28 sec. If the length of the platform is 390 m,then length of train (in meter) is

A train takes 18 seconds to pass through a platform 162 m long and 15 seconds to pass another platform 120 m long. The length of the train in meter is

A train 200 m long running at 36 kmph takes 55 seconds to cross a bridge. Length of the bridge is

The perimeter of a square and a circular field are same. If the area of circular field is 3850 sq meter. What is the area in meter of the square?

A man, a woman and a boy can complete a job in 3, 4 and 12 days respectively. How many boys must assist 1 man and 1 woman to complete the job in $$1\over4$$  of a day?

A can cultivate $$2\over5$$ th of a land in 6 days and B can cultivate $$1\over3$$  of the same land in 10 days. Working together A and B can cultivate of $$4\over5$$  the land in;

On what sum does the difference between the compound interest and the simple interest for 3 years at 10 % is Rs 31?