Problema Solution
craig drives 20km/hr faster than Marilyn. In the same time that Marilyn drives 225 km,Craig drives 325 km.Find the speed of each car.
Answer provided by our tutors
Let speed of Marilyn = x
=> Speed of Craig = x + 12
Time taken by Marilyn for 225 Kms = Distance / Speed
= 225/x
Time taken by Craig to drive 325 Kms = 325 / (x+20)
Both times are equal
=> 225/x = 325/(x+20)
=> 325x = 225x + 225*20
=> 100x = 225*20
=> x = 225*20/100 = 45
=> Marilyn's speed = 45 kph
=> Craig's speed = 45 + 20 = 65 Kph