SOLUTION: 1)A lorry travels at 50km per hour. Given that diameter of its wheel is 88Cm, find how many revolutions per minute the wheel is turning. Give your answer to the nearest whole no.

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Question 529580: 1)A lorry travels at 50km per hour. Given that diameter of its wheel is 88Cm, find how many revolutions per minute the wheel is turning. Give your answer to the nearest whole no.
2)what is the cost of spraying insecticide on a field measuring 2000m by 3200m if the cost is $22 per hectare.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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1)A lorry travels at 50km per hour.
Given that diameter of its wheel is 88Cm, find how many revolutions per minute the wheel is turning.
Give your answer to the nearest whole no.
:
divide the no. of cm traveled in 1 hr by 60 * circumference of the wheel
%2850%2A1000%2A100%29%2F%2860%2Api%2A88%29 = 301 rpm
:
2)what is the cost of spraying insecticide on a field measuring 2000m by 3200m if the cost is $22 per hectare.
:
1 hectare = 10,000 sq/m
:
Divide the area in sq/m by the area of 1 hectare, mult by $22
%282000%2A3200%29%2F10000 * 22 = $14,080