a car traveling at 87 km/h and a bus leave a tollbooth at the same time. twenty minutes later, the bus is 3 km farther from the tollbooth than the car.
2007-09-17 15:58:08 · 3 answers · asked by Chipee 1 in Science & Mathematics ➔ Mathematics
find the distance travelled by the car in 20 minutes.
add 3 km to find the distance the bus travelled.
Divide distance traveled by the bus by time taken to cover it to find average speed.
2007-09-17 16:11:06 · answer #1 · answered by swd 6 · 0⤊ 0⤋
20 min = 1/3 hr. in that time, bus went 3 km farther than car. so in 1 hr, bus will go 9 km farther, which means it's going 9 km/h faster, so bus speed is 87+9 = 96 km/h.
2007-09-17 23:11:14 · answer #2 · answered by Philo 7 · 0⤊ 0⤋
the car has traveled 87km/hr * 1/3 hr = 29 km
The bus has traveled 29km + 3km =32 km
bus speed * 1/3 hr = 32 km
speed = 96 km/hr
2007-09-17 23:13:36 · answer #3 · answered by Anonymous · 0⤊ 0⤋