|Quote, originally posted by CheddaJetta »|
|If 2 cars are traveling on I-90 towards each other and 1 car is traveling at 65mph and the other at 75 mph, when will they pass each other supposing that they started 300 miles apart? |
To solve this you have to calculate the combined speed of both vehicles. That's 130mph. Now, the question that you are asking is how long does it take to travel 300 miles at this speed. You know that it takes at least 2 hours since that will put you at mile 260.
Now you have to calculate how many minutes it will take to go 40 miles at 130mph. First lets divide 130mph to figure out how fast that is per minute. 130/60=2.1667 miles per minute. Now divide the remaining 40 miles by the 2.16. 40/2.1667 = 18.46 minutes. So now we know that is' 2 hours, 18 minutes.
Of course .46 minutes is under 30 seconds, but lets do the math anyway. There are 60 seconds in a minute, and you want to know how many is .46 of them. 60*.47=27.6
So, the two cars will pass each other in 2 hours, 18 minutes and 27.6 seconds.