Without any stoppages a person travels a certain distance at an average speed of 40 km/hr and with stoppages he covers the same distance at an average of 20 km/hr. How many minutes per hour does he stop?
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Answer: 30 minutes
Step-by-step explanation:
case 1 : without stoppage
Speed = 40 km/hr
In 1 hr ==== 40 km
case 2: with stoppage
Speed = 20 km/hr
In 1 hr ==== 20 km
So to cover 40 km (case 1) he will take 2 hours
This 1 additional hour is due to stoppages. Stoppage time = 1/2 hr or 30 minutes.
ALTERNATE:
He travels 20 km less in given time.
Hence stoppage time = 20/40 * 60 = 1/2 * 60 = 30 minutes
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