Question
Kathy and David have a bicycle race. Kathy cycles at a speed of 18 km/h. David cycles at a speed of 21 km/h. If David lets Kathy start 40 min before him, how long will David take to catch up with Kathy?
3 m

Click button first when a symbol is required. X

Kathy and David have a bicycle race. Kathy cycles at a speed of 18 km/h. David cycles at a speed of 21 km/h. If David lets Kathy start 40 min before him, how long will David take to catch up with Kathy?