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Linear Equations in One Variable

SAT Math· difficulty 4/5

A train leaves Station A traveling east at 5050 mph. Two hours later, a second train leaves the same station traveling east at 7070 mph. How many hours after the second train leaves do they meet?

  • A

    7

  • B

    3

  • C

    5

    check_circle
  • D

    4

Explanation

Let tt = time after second train leaves. First train has 2+t2 + t hours of travel. 50(2+t)=70t50(2 + t) = 70t, so 100=20t100 = 20t and t=5t = 5.

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