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Question
Train A leaves P at noon sharp. Two hours later train B leaves P in the same direction. Train B overtakes Train A at 8pm. Find the average speed of the two trains over this journey if the sum of their average speeds is 70km/hr
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Answer
let the total distance be d
for a time=8
for b time=6
eqn-d/8 + d/6=70 (avg speed =total dis/total time)
=d=240
a=30
b=40
