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A body has to travel 120km distance. It ...

A body has to travel 120km distance. It travels first 30km with uniform speed 30km/hr. Its average speed is 60 km/hr. What should be its speed in next 90 km distance?

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The correct Answer is:
5
For collision `u=sqrt(u_(B)^(2)+u_(C)^(2))=sqrt((75/5xx5/18)^(2)+(54/5xx5/18)^(2))=sqrt(4^(2)+3^(2))=5 m//s`
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