Question 96720: During rush hour, Fernando can drive 40 miles using the side roads in the same time that it takes to travel 30 miles on the freeway. If Fernando's rate on the side roads is 7 mi/h faster than his rate on the freeway, find his rate on the side roads.
A car uses n gallons of gasoline on a trip of dist miles.
At that rate, how much gasoline will a trip of dist 2 miles require?
One number is 5 times another. If the sum of their reciprocals is 1/5 , find the two numbers.
A plane took 1 hour longer to travel 560 miles on the first portion of a flight than it took to fly 480 miles on the second portion. If the speed was the same for each portion, what was the flying time for the second part of the trip?
Answer by anjali_yamini(27)   (Show Source):
You can put this solution on YOUR website!
x= 5y; 1/x + 1/y= 1/5
1/5y + 1/y = 1/5
(1+5) /5y = 1/5
6/5y = 1/5
6*5 = 5y
30 = 5y
6 = y
CHECK :
1/x + 1/y = 1/30 + 1/ 6
= (1 + 5)/30 = 1/5
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