Quantitative Aptitude Speed Time and Distance Average Speed

Mark covers a distance of D km at a speed of T km/hr. Then, he covers 2D km at half the speed. At what speed should he cover next 3D km so that average speed of entire journey is 0.8T km/hr (in km/hr)?

1

T

2

1.2T

3

0.9T

4

0.72T

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