Question

two cars start from the same place at the same time but in opposite directions their speeds 80km/hr and 65 km/hr .after how long will they be 580 km apart

Answer 1

after 1 hours distance will be 145.
580 ÷ 145 = 4
145+145+145+145 =580
therefore 1 hours x 4 = 4 hours
Answer is 4 hours

Answer 2

They will be 580 km apart after 4 hours.

Step-by-step explanation:

We are given that two cars start from the same place at the same time but in opposite directions their speeds 80 km/hr and 65 km/hr.

We have to find after how long will they be 580 km apart.

As we know that the Speed, Distance and Time formula is given by;

                 $\text{Time} = \frac{\text{Distance}}{\text{Speed}}$

Here, the speed will be the relative speed because the two cars move in opposite directions.

So, the relative speed = Speed of first car + Speed of second car

                                     = 80 km/hr + 65 km/hr = 145 km/hr

Now, the time they will be 580 km apart =  $\frac{580}{145}$ = 4 hr.

Hence, the two cars will be 580 km apart after 4 hours.