Question
Usha and Zeph have a bicycle race. Usha cycles at a speed of 15 km/h. Zeph cycles at a speed of 20 km/h. If Zeph lets Usha start 40 min before him, how long will Zeph take to catch up with Usha?
3 m

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Usha and Zeph have a bicycle race. Usha cycles at a speed of 15 km/h. Zeph cycles at a speed of 20 km/h. If Zeph lets Usha start 40 min before him, how long will Zeph take to catch up with Usha?