Mike drives this car 60 km in 55 minutes. What is its average speed in kilometres per hour?
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answer : 65.45 km / hr
explanation :
speed = distance / time
distance = 60 km ( given )
time = 55 minutes = 55 / 60 hours ( given time is in minutes so we should convert it to hour by dividing the minutes by 60 )
so speed = ( 60 ) / ( 55 / 60 )
= ( 60 * 60 ) / 55
= 3600 / 55
= 65.45
therefore average speed of mike's car is 65.45 kilometres per hour
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