• # question_answer 19) A car takes 2 hours to reach a destination by travelling at the speed of 60 km/h. How long will it take when the car travels at the speed of 80 km/h?

Let it take $x$ hours. We have the following table.
 Speed (in km/h) 60 80 Number of hours 2 $x$
Lesser the speed, more the number of hours to reach the destination. So, this is a case of inverse proportion. Hence,       $60\times 2=80\times x$ $\Rightarrow$               $x=\frac{60\times 2}{80}$ $\Rightarrow$               $x=\frac{3}{2}=1\frac{1}{2}$ Thus, $1\frac{1}{2}$ hours would be taken.