cover?ii) A man walks at a speed of 1m/s and covers at certaindistance

1.	cover?ii) A man walks at a speed of 1m/s and covers at certaindistance in some time. But, if he walks at a speed of 3m/s,he covers an additional distance of 15 m in the same time.What is the distance he actually covered?(242-5)
Answer» = Let the actual distance be x. = Given, = If man walks at 1 m/s ---- he covers x m = If he walks at 3 m/s---- he covers x + 15 m = x + 15 = 3 * x = - 2 x = - 15 = x = 7.5 m but how x+15=3*x

cover?ii) A man walks at a speed of 1m/s and covers at certaindistance in some time. But, if he walks at a speed of 3m/s,he covers an additional distance of 15 m in the same time.What is the distance he actually covered?(242-5)

Answer»

= Let the actual distance be x.

= Given,

= If man walks at 1 m/s ---- he covers x m

= If he walks at 3 m/s---- he covers x + 15 m

= x + 15 = 3 * x

= - 2 x = - 15

= x = 7.5 m

but how x+15=3*x