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1 hr

2 hr

3 hr

4 hr

A. 1 hr

Let the duration of the flight be x hours.

$Then,\frac{600}{x}-\frac{600}{x+(1/2)}=200$

$\Rightarrow \frac{600}{x}-\frac{1200}{2x+1}=200$

$\Rightarrow x(2x+1)=3$

$\Rightarrow 2{x}^{2}+x-3=0$

$\Rightarrow (2x+3)(x-1)=0$

$\Rightarrow x=1hr.[neglectingthe-vevalueofx]$