(a) You walk in a train at 3 miles per hour
(a) You walk in a train at 3 miles per hour. The train moves at 50 miles per hour. Your ground speed is ____ miles per hour.
(b) You walk in a train at 3 miles per hour. The train is shown on TV (1 mile train = 20 inches on TV screen). Your speed across the screen is ____ inches per hour.
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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §4.1 The Chain Rule, #58
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