A truck covers 30 km at a uniform speed of 30 km/hr What should be its speed for the next 90 km if the average speed for the entire journey is 60 km/h ?
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Total distance 30+90=120km
Average speed =60km/h
Total Time =120/60 =2hrs
Time for 90 km journey =90 min (2hrs -1/2 hr )
Required speed of truck =90/1.5 =60 km/hr
Average speed =60km/h
Total Time =120/60 =2hrs
Time for 90 km journey =90 min (2hrs -1/2 hr )
Required speed of truck =90/1.5 =60 km/hr
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