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Best Answer

You need the speed in terms of inches per some_unit_of_time:

1 mile = 63360 inches

1 minute = 60 seconds

1 hour = 60 minutes = 60 × 60 seconds = 3600 seconds

20 miles/hour = 20 × 63360 inches/(3600 seconds)

= 352 inches/second

Now you can calculate the time:

time = distance ÷ speed

→ time = 115 inches ÷ 20 mph

= 115 inches ÷ 352 inches/second

= 115/352 seconds

≈ 0.327 seconds

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Wiki User

7y ago
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Wiki User

7y ago

Approx 0.3267 seconds.

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Q: How long does it take for a car to go 115 inches Going 20 miles per hour?
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