A man can reach a certain place in 30...

A man can reach a certain place in 30 hours. If the reduces his speed by`1/(15)t h` he goes 10 km less in that time. Find his speed. `4\ k m//h r` b. `5\ k m//h r` c. `5 1/2k m//h r` d. `6k m//h r`

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5km/h

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