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

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