Question #4695d

1 Answer
May 30, 2017

Average speed is defined as the distance travelled by an object in a unit time. The SI unit is ms^-1 or metre per second.

Explanation:

Average speed is given by the formula:-
v = x / t where,
v = speed of the object
x = total distance travelled (in metre)
t = time taken (in second)

In the question, x = 66 miles, which is roughly equal to 106216.704 metre.
and for time taken (t) = 4pm - 2.48 pm = 1 hour and 12 minutes = 4320 second.

Hence, by the given relation, the average speed is:-
v = 106216.704 / 4320
or v = 24.58 ms^-1