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Best Answer

You have to use the formula :

time (in hours) x speed (in km/h) = distance (in km)

to solve your question

Since you are looking for time, you will have to solve for it :

time = distance / speed

you might also wish to get a result in Minutes, not in fractions of an hour, which is awkward to work with:

time = (distance / speed) x 60

You don't have to use brackets, but it makes it easier to understand.

time (min) = 78 / 100 x 60

46.8 minutes or 48 minutes and 48 seconds

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9y ago
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Q: How long does it take to drive 78 km at 100km per hour?
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