Question by avishek_saha24: CAT questions?
The Sinhagad Express left Pune at noon sharp . 2 hrs later the Deccan Queen started from Pune from the same direction . The Deccan Queen overtook the Sinhagad Express at 8 pm . Find the average speed of the 2 trains over this journey if the sum of their average speed is 70 km/hr ?
Answer by DC – ドン
let the rate of the first one be X
then the other one is 140 – X
.. . .
distance = rate*time
X*8 = (140-X)*6
14X = 140*6
X = 60
thus the first one averages 60kph
the second one averages 80 kph
.. . .. .
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