Problema Solution
Craig drives 20mph faster than Mary. In the same time that Mary drives 225 miles, Craig drives 325miles. Find the speed of each.
Answer provided by our tutors
Let Mary's speed by x mph
Therefore, Craig's speed= x+20 mph
Time taken by Mary to travel 225 miles=225/x hrs
Time taken by Craig to travel 325 miles=325/(x+20) hrs
225/x=325/(x+20)
225(x+20)=325x
100x=225*20
100x=5000
x=50
Mary's speed=50 mph
Craig's speed=70 mph