Question
Risa and Pierre have a bicycle race. Risa cycles at a speed of 16 km/h. Pierre cycles at a speed of 20 km/h. If Pierre lets Risa start 30 min before him, how long will Pierre take to catch up with Risa?
3 m

Click button first when a symbol is required. X

Risa and Pierre have a bicycle race. Risa cycles at a speed of 16 km/h. Pierre cycles at a speed of 20 km/h. If Pierre lets Risa start 30 min before him, how long will Pierre take to catch up with Risa?