Answer :
Given, 90% of x = 315km
Need to find the value of x
⇒ × X = 315
⇒ X =
⇒ X = 350km
⇒ Option A is incorrect as 325 ≠ 350
⇒ Option B is correct as 350 = 350
⇒ Option C is incorrect as 405 ≠ 350
⇒ Option D is incorrect as 340 ≠ 350
Hence, option B is the correct one.
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