Write an equation that gives the distance between John and Mary in terms of the time elapsed

John and Mary leave their houses at the same time and meet at a coffee shop. John’s house is 3.2 miles east of the coffee shop and he is riding his bike at 8 ft. per second. Mary’s house is 2.0 miles west of the coffee shop and she is riding her bike at 6 ft. per second.

Write an equation that gives the distance between John and Mary in terms of the time elapsed since they started riding their bikes.