Question

Kevin takes T minutes to travel to work. Jane travels the same distance to work but goes 10% faster than Kevin. Find an expression, in terms of T, for the number of minutes that Jane takes to travel to work.

Answer 1

Let Kelvin speed be s units per minute.
than Janes speed 1.1s units per minute.
time taken by kelvin for d unit distance = T = d/s
time taken by jane for d unit distance = T J = d/1.1/s
T J = d/1.1/s = d/s 1.1
Time of jane = T/1.1 = 0.91 T

Answer 2

time jane takes: T + 10T/100