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Kim and OM are travelling from point A t...

Kim and OM are travelling from point A to B, which are 400 km apart. Travelling at a certain speed Kim takes one hour more than Om to reach point B. If Kim doubles her speed she will take 1 hour 30 mins less than Om to reach point B. At what speed was Kim driving from point A to B? `90\ k m p h` b. `\ 70\ k m p h` c. `160\ k m p h` d. `80\ k m p h`

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