Sally and Ramona were competing in a four-lap, one-mile foot race. Sally’s style was to run at a constant rate of 12 mph. Ramona decided to

Question

Sally and Ramona were competing in a four-lap, one-mile foot race. Sally’s style was to run at a constant rate of 12 mph. Ramona decided to run her first three laps at 11 mph, and save a ‘kick’ in order to run a 16 mph pace for the fourth and final lap. Who wins the race, and by how many minutes or seconds?

in progress 0
Cherry 4 years 2021-08-27T23:35:48+00:00 1 Answers 113 views 0

Answers ( )

  1. thucuc
    0
    2021-08-27T23:37:08+00:00
    Reply

    Sally wins the race by 0.03 min

    Explanation:

    To find time = distance / velocity

    Sally;

    1 mile / 12 mph

    = ¹/12 hrs * 60

    = 5 min

    Ramona;

    ³/4 mile ÷ 11 mph  +  ¹/4 mile ÷ 16 mph

    = ³/44 hrs + ¹/64 hrs

    = 4.09 min + 0.94 min

    = 5.03 min

Leave an answer

Browse

Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )