1. A plane travels 695km with wind and 498km aginst the wind in same time.The speed of wind is 21km/hr. Find the speed of plane?

2 Answers on this Question

1. 127.179(app)
   given distance of the train along the wind is 695
   and againt the wind is 498
   and time = distance/speed
   as we know that time is equal in both the cases hence equate
   695/s1=498/s2———–(1);
   where s1=speed of the plane + speed of the wind
   and s2=speed of the plane -speed of the wind
   given that speed of the wind is 21k/h
   s1=sp+21
   s2=sp-21
   substitu in eq 1
   we get the answer as 27.17(app)

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2. Around 135km/hr

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