SOLUTION: Mr. Strong started driving at 9:40 a.m. at an average speed of 60 km/h. Mr. Swift started driving from the same place at 10:10 using the same route. If Mr. Swift, took 3 hours to c

Question 839267: Mr. Strong started driving at 9:40 a.m. at an average speed of 60 km/h. Mr. Swift started driving from the same place at 10:10 using the same route. If Mr. Swift, took 3 hours to catch up with Mr. Strong, at what average speed was Mr. Swift driving?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
How far did Mr Strong get from 9:40 to 10:10 ?
The time difference is: hrs

km
------------------
Let = distance Mr Swift travels until
he catches up with Mr Strong
Let = Mr Swift's average speed
Start counting time when Mr Swift leaves
-----------------------------------
Mr Swift's equation:
(1)
Mr Strong's equation:
(2)
---------------------
(2)
(2)
and
(1)
(1)
(1)
Mr Swift's average speed is 70 km/hr

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