Question
Amit drove for 6 hours at a speed of 60 miles per hour
and for 6 hours at 40 miles per hour. What was his average speed (in miles per hour) for the whole journey?Solution
Distances- =60 mph × 6 hrs. = 360 miles =40 mph 6 hrs. = 240 miles Total distance =360 miles + 240 miles = 600 miles Total time = 6 hrs. + 6 hrs. = 12 hrs. Average speed =600 miles /12 hrs. =50 mph
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