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Mathematics, 23.08.2019 13:30 deadea46

Ihave been stuck on this question and i would like to know how to solve it ?
a mother horse and a baby horse walk 10 miles from point a to point b. the mother’s speed is 10 miles per hour and the baby’s 5 miles per hour. the mother rests for 2 minutes after every x minutes of walking. the baby keeps walking. they arrive together at the destination. find the range of x.

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