Question
A bus travels 200 miles at a constant speed of 50 miles
per hour. It then makes a 30-minute stop before continuing its journey at a constant speed of 60 miles per hour for another 150 miles. What is the average speed of the bus for the entire journey?Solution
ATQ, Total distance = 200 + 150 = 350 miles Time taken for the first 200 miles = 200/50 = 4 hours Time taken for the last 150 miles = 150/60 = 2.5 hours Total time = 4 + 0.5 (for the stop) + 2.5 = 7 hours Average speed = 350/7 = 50 mph
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