Mohan’s watch is 1 min slow on Tuesday at 1pm and 2min fast on Thursday at 1pm. When did it show a correct time? मोहन की घड़ी मंगलवार को दोपहर 1 बजे 1 मिनट धीमी और गुरूवार को दोपहर 1 बजे 2 मिनट तेज चलती है। यह सही समय कब दिखायेगी?

Tuesday 1pm: 1 min slow (needs to gain 1 min). Thursday 1pm: 2 min fast (needs to lose 2 min). Total change needed: 3 minutes over 51 hours (from 1pm Tuesday to 1pm Thursday). Since the watch is linear, it gains at 3/51 min per hour. To be correct (go from -1 to 0), it needs 1 hour. But we need to find when it crosses from slow to fast. At Wednesday 5am (40 hours from Tuesday 1pm), it would have gained 40 × 3/51 ≈ 2.35 minutes, crossing zero.