Question

Distinguish between instantaneous speed and average speed. A man drives a car a distance of 200km at an average speed of 44kmh¹,What must be it's average speed for the next 220km, if the car is to cover the total distance in 9 hours?

Answer 1

Answer:

49.32km/h

Explanation:

Given a man drives a car a distance of 200km at an average speed of 44km/h

We know that $average speed=\frac{total distance}{time}$

initially $44=\frac{200}{time}$

time=4.54 hours

Now Given the total trip should be completed in 9 hours

the time taken to complete the second part of the trip is 9-4.54=4.46 hours

Given the distance travelled in the second half is 220km

We know that  $average speed=\frac{total distance}{time}$

$average speed=\frac{220}{4.46}$

average speed = 49.32 km/h.