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Two trains are coming from opposite directions with speeds of 75 km/hr and 100 km/hr on two parallel tracks. At some moment the distance between them is 100 km. After T hours, distance between them is again 100 km. T is equal to
A. 1 hr
B. $$1{1} / {7}$$
C. $$1{1} / {2}$$
D. 2 hrs

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Two trains are coming from opposite directions with speeds of 75 km/hr and 100 km/hr on two parallel tracks. At some moment the distance between them is 100 km. After T hours, distance between them is again 100 km. T is equal to
A. 1 hr
B. $$1{1} / {7}$$
C. $$1{1} / {2}$$
D. 2 hrs
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3 Answers

  1. Trains speed = (75 + 100)km/hr = 175 km/hr
    How much time it took to cover 175 kmat
    Trains speed = 1 hr∴T =
    How much time it took to cover 200 km = (1175×200)hr=87hr=117hr

    So the answer id (B).

    • -2
  2. Here length of the train =100+100=200km
    Then
    Gn
    Trains are in opposite direction :
    So speed=s1+s2
    . =75+100=175km/hr
    Time T=D/S
    =200/175
    =8/7
    =1(1/7) hr

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