The tractor

The tractor sows an average of 1.5 ha per hour. In how many hours does it sows a rectangular trapezoid field with the bases of 635m and 554m and a longer arm 207m?

Correct result:

t =  7.5499 h

Solution:

a=635 n c=554 m b=207 m  h=b2(ac)2=2072(635554)2=72 7 m190.4941 m  S=a+c2 h=635+5542 190.4941113248.7391 m2  S1=S ha=S/10000  ha=113248.7391/10000  ha=11.32487 ha  t=S1/1.5=11.3249/1.5=7.5499 h



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