Question

A car takes 2 hours to reach a destination by travelling at 60

km /hr. How long will it take while travelling at 80 km/hr.​

Answer 1

Let the car takes x hours to reach a destination by travelling at the speed of 80 km/h. Then,

Speed (in km/hr) 6080

Time (in hours) 2 x

Clearly, more the speed, less will be the time taken. So, it is a case of inverse proportion.

$∴ 60 × 2 = 80 × x ⇒x = \frac{60 \times 2}{80} = \: \frac{3}{2}$

$hence, \: the \: time \: taken \: will \: be \: 1 \frac{1}{2} hours$