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A boat can go across a lake and return i...

A boat can go across a lake and return in time`T_0` Full Marks at a speed `V_1`. On a rough day there is uniform current at speed `V_2` to help the onward journey and impede the return -journey. If the time taken to go across and return be T, then `T/T_0`:

A

`1-(v_2^2)/(v_1^2)`

B

`1/(1-(v_2^2)/v_1^2))`

C

`1+(v_2^2)/(v_1^2)`

D

`1/(1+(v_2^2)/v_1^2))`

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