120km/hr
60km/hr
670km/hr
40km/hr
Correct answer is B
Speed = \(\frac{distance}{time}\)
let x represent the speed, d represent distance
x = \(\frac{d}{4}\)
d = 4x
2x = \(\frac{600 - d}{3}\)
6x = 600 - d
6x = 600 - 4x
10x = 600
x = \(\frac{600}{10}\)
= 60km/hr
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