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?
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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