Question

sara runs several times a week and always keeps track of how much time she runs each time she goes out. one day she forgets to take her stopwatch with her and wonders if she can still have some idea of her running time. as she passes a particular pond, she remembers that it is 5.6 km from her house. she knows from her previous training that she has a consistent pace of 3.4 m/s. how long has sara been running when she reaches the pond? a. 16 minutes c. 27.5 minutes b. 27.5 s d. 1 hour

Answer 1

To find the time we can simply do unit analysis to get the time in seconds then convert that into minutes.

We can flip 3.4m/s to get seconds on the top

1s/3.4m × 5600m = 5600ms/3.4m = 1647s

to turn seconds into minutes:

1646s × (1 minute ÷ 60s) = 27.45 minutes = 27.5 minutes