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​

Answer 1

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

Answer 2

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