Hmmm. 1) The train would arrive at the platform in 10 minutes = The train may arrive within the next 10 minutes. The first sentence is either conditional and lacking an "if" part (which may be implied by context) or is the past tense of "The train will arrive at the platform in 10 minutes".
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morchAre the following equivalents correct in both tense and grammar?No. See below
morch1 It would be alright, if my daughter wears a wristband.1. It would be all right if my daughter wore a wristband. (wears a wristband also possible but more informal).
2 Johnny, if I had your parents' permission, I would let you go to the camp with others tomorrow.