Problema Solution
Kelly and Tom started walking from the same starting point but in the opposite directions along a straight path. Kelly's average speed was 4km/h faster than Tom's. After walking for 3hours, they were 40km apart. What was Kelly's average speed?
Answer provided by our tutors
Let tom's travelled distance=x
Kelly's =40-x
(40-x)/3-x/3=4
40-2x=12
2x=28
x=14
kelly's average speed was= 26km/h