120km/hr
60km/hr
670km/hr
40km/hr
Correct answer is B
Speed = distancetime let x represent the speed, d represent distance x = d4 d = 4x 2x = 600−d3 6x = 600 - d 6x = 600 - 4x 10x = 600 x = 60010 = 60km/hr
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