Question

an object covers 40 km in first 1/2 hours and 80 km in next 1/2 hour . calculate it's average speed.
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Answer 1

Answer:

The next 40 km is covered at an average speed of 40 km/h, so it takes 40*60/40 = 60 minutes. So 80 km are covered in 30+60 = 90 minutes or 1.5 hrs, so the average speed for the 80 km trip is 80/1.5 = 53.33 km/h. = 160/3 = 53.33 kmph.