Question

A car travels at a constant speed, as shown on the double number line.

How far the does the car travel in 14 hours?

Answer 1

980 km.

Explanation:

The speed of the car is constant,

From the double number line:

When the time is 0 hour, the distance covered is 0 km.

When the time is 1 hour, the distance covered is 70 km.

When the time is 2 hours, the distance covered is 140 km,

which can be written as

when the time is 2 hours, the distance covered is 70 x 2 km.

Similarly,

When the time is 3 hours, the distance covered is 210= 70 x 3 km.

This can be generalized as,

When the time is n hours, the distance covered is 70 x n km, i.e

The distance traveled in n hours = 70 x n km.

So, for 14 hours, n= 14,

Hence, the distance traveled in 14 hours = 70 x 14= 980 km.

Explanation:

Answer 2

980 Km

Explanation:

Calculate the speed of the car from the table

speed =
`(distance)/(time)`

Using any value from the table , say distance = 140 , time = 2 hours , then

speed =
`(140)/(2)` = 70 Km per hour

distance = speed × time

= 70 × 14

= 980 Km