An aeroplane covered a distance of 500 km at an average speed of x km/h. On the return journey , the speed was increased by 40 km/h. The time taken for the return journey is
(I) 400/x
(ii) 500/(x+40)
(iii) x/500
(iv) x-40/400
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Answer:
2 one is the correct answer as time = distance /speed
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