Two straight roads intersect at right angles. A bicycle is moving towards the intersection along one road at a constant speed of 10 miles per hour. A man is walking away from the intersection along the other road at a constant speed of 5 miles per hour. (a) At what rate is the distance between the man and the bicycle changing when the bicycle is 3 miles away and the man is 4 miles away from the intersection? (b) Is the distance between the man and the bicycle increasing or decreasing at that instan
Unitary Method
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Two straight roads intersect at right angles. A bicycle is moving towards the intersection along one
road at a constant speed of 10 miles per hour. A man is walking away from the intersection along
the other road at a constant speed of 5 miles per hour.
(a) At what rate is the distance between the man and the bicycle changing when the
bicycle is 3 miles away and the man is 4 miles away from the intersection?
(b) Is the distance between the man and the bicycle increasing or decreasing at that instant
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