Carl can do a particular job in 4 hours. It takes Mike 7 hours to do the same job. Approximately how long will it take them to do the same j

Question

Carl can do a particular job in 4 hours. It takes Mike 7 hours to do the same job. Approximately how long will it take them to do the same job working together?​

in progress 0
Eirian 2 weeks 2021-08-28T09:25:06+00:00 2 Answers 0 views 0

Answers ( )

    0
    2021-08-28T09:26:16+00:00

    Answer:

    2 hours and 32.7 minutes. This is a good problem to become familiar with. It comes up in physics quite frequently.

    Step-by-step explanation:

    1 job/4 hours + 1 job / 7 hours = 1/x

    1/4 + 1/7 = 1/x

    (7 + 4)/28 = 1/x

    11/28 = 1/x

    x / 1 = 28/11

    x = 2.54 hours repeating.

    1 hour = 60 minutes

    0.54 hours = x minutes

    1/.54 = 60/x

    x = 0.54 * 60

    x = 32.7 minutes

    0
    2021-08-28T09:26:29+00:00

    Answer:

    28/11hr or about three hr

    Step-by-step explanation

    1/4+1/7=11/28

    or 28/11 hr

Leave an answer

Browse

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