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trapecia [35]
3 years ago
7

In the first half (distance) of a trip, a truck travels at a speed of 70 km/hr. How fast must it go during the second half of th

e trip to average 80 km/hr for the entire trip? km/hr
Mathematics
1 answer:
hjlf3 years ago
7 0
So, there are 2 halves, now if the truck goes 90 mph on the second half, the average speed then will be 

\bf \cfrac{\stackrel{mph}{70}+\stackrel{mph}{90}}{\stackrel{half}{1}+\stackrel{half}{1}}\implies \cfrac{160}{2}\implies 80
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