ANSWERS: 1
  • Tom drove 90 mph for 20 minutes. How far did he go? First, let's get things into the same units. 90 miles/hr * 1/60 hr/min = 3/2 miles/min 3/2 miles/min * 20 min = 30 miles. So the point where Tom passed Janice was 30 miles from Bigtown. It took Janice Tom's 20 minutes plus her 10 minute headstart to reach that point, or 30 minutes total. We want her speed in mph, not miles per minute, so we take her time as 1/2 hr. 30 miles / (1/2 hr) = 60 miles/hr So the answer is 60 mph.

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