A man drove for 4 hours at a certain speed, he then doubled his speed and drove for another 3 hours. Although he covered 600 kilometers. At what speed did he drive for the last 3 hours?

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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A man drove for 4 hours at a certain speed, he then doubled his speed and drove for another 3 hours. Although he covered 600 kilometers. At what speed did he drive for the last 3 hours?

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