Question

A riverboat travels downriver (with the current) at a speed of 15 km/h. The current is 3km/h. To someone on the shore, how fast is the riverboat moving?

Answer 1

18km/h

Explanation:

if the riverboat is already going 15 km/h and the current is 3km/h then you should add and you get 18 km/h

Answer 2

18km/h

Explanation:

if the riverboat is already going 15 km/h and the current is 3km/h then you should add and you get 18 km/h