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Slowing by snowing (Posted on 2010-09-13) Difficulty: 2 of 5
A snowplow heads out to plow a 50 mile stretch of highway when there is already an inch of snow on the ground. The snow is falling steadily at a rate of one inch per hour. The speed of the plow is 50/d mph where d is the depth of the snow in inches.

How long does the plow travel this 50 mile stretch of road? (one way)

See The Solution Submitted by Jer    
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re(2): numerical integration | Comment 4 of 6 |
(In reply to re: numerical integration by Jer)

"Is it still called integration when dt has not gone to zero?"

Yes; see Wikipedia's Numeric Integration article. Graphing calculators have NINT functions that use finite deltas for what amounts to Riemann sums.

  Posted by Charlie on 2010-09-13 15:29:45
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