SOLUTION: Two bicyclists are seven-eighths of the way through a one-km-long tunnel when a train approaches the closer end at 40 km/h. The riders take off at the same speed in opposite direc

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Question 717919: Two bicyclists are seven-eighths of the way through a one-km-long tunnel when a train approaches the closer end at 40 km/h. The riders take off at the same speed in opposite directions, and each escapes the tunnel as the train passes them. How fast did they ride?
Answer by lwsshak3(11628) About Me  (Show Source):
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Two bicyclists are seven-eighths of the way through a one-km-long tunnel when a train approaches the closer end at 40 km/h. The riders take off at the same speed in opposite directions, and each escapes the tunnel as the train passes them. How fast did they ride?
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Speed=distance/travel time
Distance bicyclists had to cover=(7/8) km
Their travel time had to be≥travel time of the train
travel time of the train=1km/(40km/hr)=(1/40) hr
speed of bicyclists=(7/8)km/(1/40)hr=35km/hr
How fast did they ride? 35 km/hr