Question
Esther and Valen have a bicycle race. Esther cycles at a speed of 18 km/h. Valen cycles at a speed of 21 km/h. If Valen lets Esther start 30 min before him, how long will Valen take to catch up with Esther?
3 m

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Esther and Valen have a bicycle race. Esther cycles at a speed of 18 km/h. Valen cycles at a speed of 21 km/h. If Valen lets Esther start 30 min before him, how long will Valen take to catch up with Esther?