Respuesta :
40 minutes. If the first bus started at 4:00, by the time the second bus left ( an hour later ) the first bus has already gone 40 miles. The second bus is going a mile a minute, since sixty divided by 60 ( the amount of minutes in an hour ) is 1, They need to go 40 miles, so it will take 40 minutes for the second bus to catch up with the first bus.
Answer:
Time passes until the second bus catches up with the first bus = 2 hours
Step-by-step explanation:
One bus leaves the terminal at 4:00 p.m. and travels at 40 miles per hour.
Speed of Bus 1 = 40 miles per hour
Time of leaving of Bus 1 = 4:00 p.m
The second bus leaves the terminal at 5:00 p.m. and travels at 60 miles per hour.
Speed of Bus 2= 60 miles per hour
Time of leaving of Bus 2 = 5:00 p.m
We need to find when they catch up
That is the distance traveled by them are same,
Let the time of travel for bus 1 be t, so time of travel for bus 2 is t -1
We have
Distance = time x Speed
Distance traveled buy bus 1 = Distance traveled buy bus 2
40 x t = 60 x (t -1 )
40 t = 60 t - 60
20t = 60
t = 3 hours,
So after 3 hours of starting of bus 1 they catch up,
Time passes until the second bus catches up with the first bus = t- 1 = 2 hours
Time passes until the second bus catches up with the first bus = 2 hours