Two planes started at the same time from two airports that are 3600 kilometers apart and flew toward each other. One plane flew at 792 kilometers and the other flew at 888 kilometers per hour. In how many hours were the planes still 240 kilometers part?
What is their combined speed approaching each other?
The two cover all but 240km of the 3600. What is that distance?
Divide the distance by the speed to find how long.
distance= rate*time
3600-240=(792+888)km/hr * time
solve for time.
To find out how many hours the planes were still 240 kilometers apart, we can calculate their relative speed.
The relative speed of the two planes is the sum of their speeds, since they are flying towards each other. In this case, the relative speed would be 792 km/h + 888 km/h = 1680 km/h.
Now, we can use the formula: time = distance / speed
Here, the distance we are interested in is 240 kilometers, and the relative speed is 1680 kilometers per hour.
Plugging these values into the formula, we get:
time = 240 km / 1680 km/h
Dividing 240 by 1680 gives us 0.142857142857142857...
Since we are looking for the time in hours, we round the decimal number to the nearest whole number.
Therefore, the planes were still 240 kilometers apart after approximately 0.14 hours, which is equivalent to about 8 minutes.