Question

Bob starts running. Bill starts running 5 seconds later. Write an expression to represent the varying number of seconds Bob has been running in terms of t, the varying number of seconds Bill has been running. (Illustrate this situation with a diagram first)

Answer 1

Y=t+5

Explanation:

Bob starts running...(1)

Bill starts running 5 seconds later...(2)

From (1) and (2) we know that Bob had been running for 5 seconds when Bill started running.

The expression we are looking for is

Y=t+5

Y is the number of seconds Bob has been running

t is the number of seconds Bill has been running

Check the image for the diagram.