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# Miles/hour and time question help

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1. Miles/hour and time question help
Daniel leave his house at 7:00. He drives 87 miles to work. He drives at an average speed of 36 miles per hour. What time does he arrive at work?

My answer: break the miles down into his hours so I'd get 36 = 1 hr, another 36 = 1 hr and 15 so roughly 30 mins totalling to 2 hrs and 30 mins. 7:00 + 2:30 = 9:30. Is this correct? If not please explain how to get the right answer.

Thanks
2. Re: Miles/hour and time question help
(Original post by Magenta96)
Daniel leave his house at 7:00. He drives 87 miles to work. He drives at an average speed of 36 miles per hour. What time does he arrive at work?

My answer: break the miles down into his hours so I'd get 36 = 1 hr, another 36 = 1 hr and 15 so roughly 30 mins totalling to 2 hrs and 30 mins. 7:00 + 2:30 = 9:30. Is this correct? If not please explain how to get the right answer.

Thanks
87/36 = 2.41 hours

to convert 0.41 to minutes:

60 mins x 0.41 = 25mins

total time taken = 2h 25m

He arrives at 9:25pm

(Haven't done maths in years though so maybe a second opinion on that ^)
Last edited by Ras17; 15-05-2012 at 21:43.
3. Re: Miles/hour and time question help
For these type of questions, remember that
Distance = speed x time
Speed = Distance / Time
Time = Distance / speed

and when dealing with Time, remember that decimal of a number needs to be multiplied by 60.
as, say, 0.54 is not 54 minutes, instead it is 0.54 x 60 = 32.4 minutes.

(Original post by Ras17)
87/36 = 2.41 hours
to convert 0.41 to minutes:
60 mins x 0.41 = 25mins
total time taken = 2h 25m
He arrives at 9:25pm
This working out is correct.

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Last updated: May 15, 2012
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