With the wind, an airplane travels 1120 miles in seven hours. Against the wind, it takes eight hours. Find the rate of the plane in still air and the velocity of the wind.  Select the correct option:
A) 10 kmph	B) 11 kmph	C) 12 kmph	D) 13 kmph	E) 14 kmph
1120 miles in seven hrs that means up speed is  1120/7= 
<gadget id="calculator"> 1120/7</gadget>
<output>160</output>
160.   for against the wind 1120 miles in 8 hrs so down speed  1120/8= 
<gadget id="calculator"> 1120/8</gadget>
<output>140</output>
140.   now plain speed in still air=1/2(160+140)=150 kmph   wind speed=1/2(160-140)=10 kmph   10 kmphNSWER:10 kmph
<result>A</result>
With the wind, an airplane travels 1120 miles in seven hours. Against the wind, it takes eight hours. Find the rate of the plane in still air and the velocity of the wind.