While riding his bike on vacation in Canada, Little Joey Johnson made sure his
speedometer read a constant 8.5 miles per hour. He rode from downtown
Vancouver to nearby Langley and back, a round trip distance of 64 km. How
long was he gone?

Question

While riding his bike on vacation in Canada, Little Joey Johnson made sure his
speedometer read a constant 8.5 miles per hour. He rode from downtown
Vancouver to nearby Langley and back, a round trip distance of 64 km. How
long was he gone?

anonymous · Answer

8.5 miles per hour = 8.5 x 1.6 km/h = 13.6km/h
$$v=s/t \rightarrow t=s/v$$
$$t=64/13.6=4.71 hours$$