4. A car covers first 50 km of its journey in 45 minutes, next 50 km in half an hour
and the next 50 km in 1 hour. Find its average speed for the journey.
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Explanation:
total distance =150 km
total time taken =45+30+60 min
=135 min = 2 hour 15 min=9/4 hours
therefore,average speed=150÷9/4=150*4/9
=200/3=66.66km/hr
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