Question: A boy on his bicycle intends to arrive at a certain time to a market that is 30 km away from his school. After riding

A boy on his bicycle intends to arrive at a certain time to a market that is 30 km away from his school. After riding 10 km, he rested for half an hour, and as a result, he was obliged to ride the rest of the trip at 2 km/hr. faster. What was his original speed?

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