Question

a car travels 280 km in 4.0 h.
a. what is the average speed?
b. how far will it go in 7 h at this average speed?
c.how long will it take to travel 300 km at this average speed?

Answer 1

Hey mate.
Here are your answers-

Given- Car travels 280km in 4.0hrs.

【Ans.a】- Average speed of car =
$\frac{distance}{time} \\ = \frac{280km}{4hours} = 70km \: per \: hour$
Therefore, Average speed of the car= 70km/h-1

【Ans.b】- Distance it travels in one hour= 70km (by using 1).
Distance it will travel in 7 hours = Speed×Time
$= \frac{70km}{hour} \times 7hours \\ = 490km$
Therefore, It will cover 490km in 7 hours.

【Ans.c】- Time it will takes to travel 300km with its average speed =
$\frac{300km}{70km} \times hour \\ = 4.28hours$
Therefore, It will takes 4.28 hours to travel 300km.

Hope it helps!!!!!