Question

A windchill wiper turns through 140° the window cleaner sprays across 75° if the wiper goes 40° before it gets to the sprayed area how far past the sprayed area does the wiper go

Answer 1

25°

Explanation:

The maximum extent of the sprayed area is 40° +75° = 115°. So, the wiper going to 140° goes 140°-115° = 25° beyond the sprayed area.

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The graph attached is a crude representation of the problem. The overlapping blue and red areas are the area covered by the windshield wiper, starting at 0° and going to 140°. The green sector is that covered by the spray, starting at 40° and going to 115°.