Linear Equations in One Variable

SAT Math· difficulty 4/5

A boat travels 6060 miles downstream in 33 hours and the same distance upstream in 55 hours. What is the speed of the boat in still water?

  • A

    12 mph

  • B

    14 mph

  • C

    18 mph

  • D

    16 mph

    check_circle

Explanation

b+c=20b + c = 20, bc=12b - c = 12. Adding: 2b=322b = 32, so b=16b = 16 mph.

Want 10 more like this — adaptive to your weak spots?

Related questions