SOLUTION: Two scientists leave a university in seperate vans at the same time. The first scientist travels east at 20 mph and the second scientist travels west at 25 mph. If there radios ha
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Question 137427: Two scientists leave a university in seperate vans at the same time. The first scientist travels east at 20 mph and the second scientist travels west at 25 mph. If there radios have a range of 90 miles, how long before they lose radio contact? Answer by ptaylor(2198) (Show Source):
You can put this solution on YOUR website! Distance(d) equals Rate(r) times Time(t) or d=rt; r=d/t and t=d/r
distance first scientist travels=20t
distance second scientist travels=25t
Now we know that when the above two distances equal 90 mi, they will have lost contact, so our equation to solve is:
20t+25t=90
45t=90 divide both sides by 45
t=2 hrs--------------amount of time that elapses before they lose contact
