The Distance, in Miles, from Me to a Moving Train $D ( t ) = \sqrt { ( 30 t ) ^ { 2 } + ( 5 - 30 t ) ^ { 2 } }$

question 79

Multiple Choice

The distance, in miles, from me to a moving train is given by $D ( t ) = \sqrt { ( 30 t ) ^ { 2 } + ( 5 - 30 t ) ^ { 2 } }$ Here represents hours since I heard the train whistle. Calculate the distance to the train 7 hours after I heard the whistle.

• A) 5 miles
• B) 293.47 miles
• C) 86125 miles
• D) 208.55 miles

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