Asked by Anonymous

The state highway commission has decided to build a bridge over a dangerous railroad crossing. The approach ramp has to be constructed so that the bridge is 10 meters above the track. If the maximum desired grade of this ramp is 4 degrees, how far back from the edge of the bridge must the ramp start?
Answered by Vipster

look at it as a triangle

Angle is 4 degree

tan of 4 =
Side opposite(10m)/ Side adjacent

distance required = Side adjacent =
10 / tan 4
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