From the top of a tower of height $40\,m$, a ball is projected upwards with a speed of $20\,m / s$ at an angle of elevation of $30^{\circ}$. The ratio of the total time taken by the ball to hit the ground to its time of flight (time taken to come back to the same elevation) is (take $g=10\,m / s ^2$ )

  • A

    $2: 1$

  • B

    $3: 1$

  • C

    $3: 2$

  • D

    $1.5: 1$

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