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Bike Ride

Age 7 to 11 Challenge Level:

Bike

Nirmala and Riki live in different villages.
Both villages are $9$ kilometres away from the nearest market.
Nirmala rides her bike at $6$ kilometres per hour and Riki rides his
at $4$ kilometres an hour.

They both want to arrive at the market at exactly noon.
What time should each of them start riding?