Speed of train is inversaly proportional...

Speed of train is inversaly proportional to the square root of time to cover a definite distance if it takes 4 hrs. travel with speed of 40 km/ hr , then what is time takes to cover same distance at speed of 60 km/hr?

`1 (7)/(9)` hour

`2(7)/(9)` hour

`5(7)/(9)`hour

None of these

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