Posted by **Dan** on Tuesday, February 26, 2013 at 10:18pm.

Train A starts at 4 miles South of a bridge and heads North at a constant speed of 30 miles per hour. Train B starts 6 miles North of the bridge.

a. What velocity must Train B have so that the two trains cross the bridge at the same time?

b. If Train B goes at 35 miles per hour, South, how far away from the bridge do they cross?

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