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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

8y ago

What else can I help you with?