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a train leaves a station and travels north at a speed of 105mph. two hours later, a second train leaves on a parallel track and travels north at 135mph. how far from the station will they meet

Respuesta :

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Let the second train catch up after x hours 

Distance = speed X time 

135x = 105 ( 2 + x) 

135x = 210 + 105x 

30x = 210 

x = 7 hours (after 2nd train has started ) 
ANSWER 7 X 135 = 945 miles from the starting point 

CHECK 
7 X 135 = 945 miles 

9 X 105 = 945 miles

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