Question

2 trains each of length 1 mile enter into 2 tunnels of length 1 mile and 2 miles apart.Speed if trains are 5 and 10 miles/hr.Give the position as viewed by a helicopter when the trains meet?

Answer 1

2 answers · Mathematics 

 Best Answer

as the trains enter their respective tunnels... they are 3 miles apart.... 

their speed combined is 15 miles/hr 

thus they will meet in 3/15 of an hour... i.e. 12 minutes... 

the distance is 1 mile from the start of 5mph train 
the distance is 2 miles from the start of the 10mph train... 

in other words... they will meet at the end of the tunnel of the slower train... 




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Answers

Looking down from a helicopter there are 2 miles of open ground between the tunnels. The tunnels are one mile long each so the trains are 4 miles apart at.