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3 years ago

Please help me !!!!

Mathematics

1 answer:

liq [111]3 years ago

8 0

Answer:

...

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

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

...

let speed of plane in still air be x mph

speed of wind be y mph.

t=d/r

against wind speed = x-y mph

with wond speed = x=y mph

...

3640/(x-y)=7

3640 = 7x-7y

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

...

6000/x+y = 6

6000 = 6x+6y

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

...

Add (1) & (2)

2x=1520

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

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