Answer: Tanya could drive for 5 1/4 hr on half tank
3 1/2 hr = 7/2 hr
1/3 tank ---> 7/2 hr
3 * (1/3 tank) = 1 tank ---> 3* (7/2 hr) = 21/2 hr (full tank)
1/2 tank ---> 21/(2*2) hr = 21/4 hr = 5 1/4 hr (half of the above)
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