Questions

The sentence is grammatically and contextually correct. ‘His’ is the correct form of pronoun to be used. Thus, the correct formation would be, ‘He reached his destination at night’.

N.H. 1 is also called The Sher Shah Suri Marg between Delhi and Amritsar.

If some action has started in the past and is still continuing, then present perfect continuous tense should be used instead of present continuous tense. So, the phrase ‘am waiting’ needs to be replaced with ‘have been waiting’ to make the sentence contextually correct. Thus, the correct formation would be, ‘I have been waiting for three –quarters of an hour’.