book Maths Puzzle Numerical Ability

The perimeter of a rectangle is 56 in. the length is 5 less thean the width. Find the demensions.

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book Other Question

A bus traveled on a level road for three hours at an average speed 20 miles per hour faster than it traveled on a winding road. The time spent on the winding road was 4 hours. Find My problem:
A plane flies 400 miles with the wind and 320 miles against the wind in the same length of time. If the speed of the wind is 20 mph, whqat is the speed of the plane in still air?