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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