Question
Usha and Ahmad have a bicycle race. Usha cycles at a speed of 14 km/h. Ahmad cycles at a speed of 21 km/h. If Ahmad lets Usha start 30 min before him, how long will Ahmad take to catch up with Usha?
3 m

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Usha and Ahmad have a bicycle race. Usha cycles at a speed of 14 km/h. Ahmad cycles at a speed of 21 km/h. If Ahmad lets Usha start 30 min before him, how long will Ahmad take to catch up with Usha?