You can put this solution on YOUR website! d = r*t is the basic distance equation.
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75 mi/hr * t hr = 1 mile
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t = 1/75 hr
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1/75 hr * 3600 sec/hr = 48 sec
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This makes sense because we know 60 miles/hr = 1 mile/minute. That is a good rule of thumb to remember. 60 mph also = 88 ft/sec, which gives you another quick mental check for answers.