Answer:
a)80km/h or in metres 22m/s
b) 10h
Explanation:
a) firstly, to find the speed we use the formula
speed=distance/time
s=d/t
d=560km, t=7h, s=?
now that we've identified them, we slot them into the formula.
s=d/t
s=560km/7h
s= 80km/h
for the metres part, you just convert the km to m by multiplying with 1000.
And to convert time into seconds, just change it to 60s then multiply by itself to give you 3600s =1h
and multiply by the number of hours given.
b) it's just the same using the above formula given but with a slight twist. We change it around so that we make t the subject.
t x s=d/t x t (first, we multiply t on both sides)
this gives us d= t x s ( second, we don't want d as the subject but t)
so d/s = t x s/s ( we divide s on both sides, where s cancels out with itself leaving t as our subject)
thus t= d/s
now that we've changed our formula, we can now start solving the equation.
t=d/s
t= 560km/ 56km/h
t=10h