A car drives east from point A at 30 kph Another car B starting from B at the same time drives S 30 W toward A at 60 kph B is 30

Question

A car drives east from point A at 30 kph Another car B starting from B at the same time drives S 30 W toward A at 60 kph B is 30 km away from A 5 How fast in kph is the distance between the two cars changing after one hour a 76 94kph b 78 94kph c 75 94kph d 77 94kph

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