Question

Please help me !!!!

Answer 1

Answer:

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against the wind, an airplane travels 3640 km in 7 hours.

with the wind, the same plane travels 6000 km in 6hrs.

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let speed of plane in still air be x mph

speed of wind be y mph.

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t=d/r

..

against wind speed = x-y mph

with wond speed = x=y mph

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3640/(x-y)=7

3640 = 7x-7y

/7

520=x-y.....................1

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6000/x+y = 6

6000 = 6x+6y

/6

1000=x+y.....................2

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Add (1) & (2)

2x=1520

/2

x=760 mph speed of plane in still air

...

plug value of x in 2

1000=760+y

100-760=y

240 = y

240 mph speed of wind