Linear Functions

SAT Math· difficulty 4/5

A motorboat travels at 2020 mph in still water and 44 mph downstream current. Going downstream, distance dd in miles after tt hours is:

  • A

    d=24td = 24t

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  • B

    d=16td = 16t

  • C

    d=20t+4d = 20t + 4

  • D

    d=4t+20d = 4t + 20

Explanation

Downstream speed = 20+4=2420 + 4 = 24 mph. d=24td = 24t.

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