Question

Kusum always forgets how to convert miles to kilometres and back again. However she remembers that her car’s speedometer shows both miles and kilometres. She knows that travelling 50 miles per hour is same as travelling 80 kilometres per hour. To cover a distance of 200 km, how many miles Kusum would have to go?

Answer 1

50 miles per hour is same as travelling 80 km per hour.

So, 1 km covers distance in 1 h to ${\displaystyle \frac{50}{80}}$ miles.

To cover a distance of 200 km = ${\displaystyle \frac{50}{80}\times 200}$

= ${\displaystyle \frac{5\times 200}{8}}$

= 125 miles

Hence, 125 miles Kusum has to go for 200 km.