jerd

When all the leaves have fallen a girl can rake the entire yard in 4 hours. When a boy does italone,it takes him 9 hours. How long would it take them to rake the yard together? Round to the nearest minute

A car starts from a certain point at a velocity of 100 kph. After 20 seconds, another car staring from rest, starts at the same point following car A at a uniform acceleration of 3 m/s². Assuming that the road is boundless will car B overtake car A? If ye...