self Maths Puzzle

take four 7's and one 1 to get 100(note:use any arithmetic symbols)

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self Other Question

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what replaces ?
An aeroplane travels distance 2500 km, 1200 km, and 500 km, at the rate of 500 km/h, 400 km/h and 250 km/h respectively. The average speed of the plane is :

(A) 420 km/h

(B) 410 km/h