Excluding the stoppages, the speed of a truck is 90 km/h and including the stoppages, the speed of the truck is 36 km/h in a journey. For how many minutes does the truck stop per hour?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 36 minutes.
Time = (Speed without stoppage - Speed with stoppage)/Speed without stoppage × 60
Time = (90 - 36)/90 × 60 = 54/90 × 60 = 36 minutes