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Buses start from a bus terminal with a speed of 20 km/hr at intervals of 10 minutes. What is the speed of a man coming from the opposite direction towards the bus terminal if he meets the buses at intervals of 8 minutes? `3\ k m//h r` b. `5\ k m//h r` c. `4\ k m//h r` d. `7\ k m//h r`

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