Question

A car takes 2 hours to reach a destination by travelling
at the speed of 60km/h. How long will it take when the
car travels at the speed of 80km/h?​

Answer 1

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Answer 2

Given :-

A car takes 2 hours to reach a destination by travelling  at the speed of 60km/h.

To Find :-

Time required to when the  car travels at the speed of 80km/h.

Analysis :-

Consider the number of hours as a variable.

Since, the speed of car and time are in inverse proportion make an equation.

Finally, get the value of the variable.

Solution :-

Here the speed of car and time are in inverse proportion.

According to the question,

$\sf \dfrac{60}{80} =\dfrac{x}{2}$

$\sf 60 \times 2 = 80x$

By transposing,

$\sf x=\dfrac{60 \times 2}{80}$

$\sf x=\dfrac{3}{2} =1\dfrac{1}{2} \ hours$

Therefore, the car travels 1 1/2 hours at the speed of 80km/h.