The tractor

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

Correct answer:

t =  7.5499 h

Step-by-step explanation:

a=635 n c=554 m b=207 m  h=b2(ac)2=2072(635554)2=72 7 m190.4941 m  S=2a+c h=2635+554 190.4941113248.7391 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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