An aircraft left Mauritius for Singapore at 9.45 p.m.
It has to cover a distance of 1600 km at a speed of 400 kmh-!.
At what time will it reach Singapore?
1600km / (400km/h) = 4 hours.
4 hours after 9:45p.m. => 1:45a.m.
Hence it will reach Singapore at 1:45a.m. the next day. (assuming same time zones)