a girl walks 12 km at the speed oc 3 km/h. what change should she make in her speed to take (i) an hour less and (ii) an hour more to cover

Question

a girl walks 12 km at the speed oc 3 km/h. what change should she make in her speed to take (i) an hour less and (ii) an hour more to cover the distance​

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Gabriella 4 weeks 2021-08-20T15:49:37+00:00 2 Answers 0 views 0

Answers ( )

    0
    2021-08-20T15:50:42+00:00

    Answer:

    (i) 4km/h (ii) 2.4km/h

    Step-by-step explanation:

    distance = 12km

    speed =3km/h

    time taken= 12/3

                     = 4 hour

    (i) to take one hour less

    time = 3 hour

    distance = 12 km

    speed = 12/3

              = 4km/h

    (ii) to take one hour more

    time = 5 hour

    distance = 12 km

    speed = 12/5

              = 2.4km/h

    0
    2021-08-20T15:51:27+00:00

    Answer:

    Step-by-step explanation:

    Distance=12km

    Speed=3km/hr

    Using:

    Time=\frac{Distance}{Speed}

    Time=\frac{12}{3}

    Time=4hr

    Question 1

    New time=4-1=3hr

    Using:

    Speed=\frac{Distance}{Time}            

    Speed=\frac{12}{3}

    Speed=4km/hr

    Question 2

    New Time=4+1=5hr

    Using:

    Speed=\frac{Distance}{Time}

    Speed=\frac{12}{5}

    Speed=2.4km/hr

    Hope it helps

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