A hunter shoots an arrow at a deer running directly away from him. When the arrow leaves

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Question:

A hunter shoots an arrow at a deer running directly away from him. When the arrow leaves the bow,the deer is at a distance of 40 when the arrow strikes, the deer is at a distance of 50 mph speed of the arrow is 65 msWhat must have been the speed of the deer. How long did the arrow take to travel to the deer?