Question

A car travelling at 30 km/h takes 6/5 hours to travel a certain distance. How many minutes less will the car take to cover the same distance if its speed is now 45 km/h?

Answer 1

`\large \mathfrak{Solution : }`

Time taken when traveling at 30 km/h :

• 
  `(6)/(5) \: \: hr`

• 
  `(6)/(5) * 60 \: min`

• 
  `6 * 12 \: min`

• 
  `72 \: min`

Distance travelled :

• 
  `30 * (6)/(5)`

• 
  `6 * 6`

• 
  `36 \: km`

now, if the speed is 44 km/h it will take :

• 
  `(36)/(45) \: \: hr`

• 
  `(4)/(5) * 60 \: min`

• 
  `48 \: min`

The car will take 72 - 48 = 24 less minutes to cover same distance at an speed of 45 km/h .