Actually by swimming a person can easily burn more than 450 calories upto 920 calories per an hour. So, burn less than 400 calories per hour is not correct regarding swimming.
A sentence has been given in Direct/Indirect Speech. Out of the four given alternatives, select the one which best expresses the same sentence in Indirect/Direct Speech.
Engineer's Day is celebrated on the birth anniversary of Sir Mokshagundam Visvesvaraya in the memory of his contributions in engineering. Every year on his birthday i.e, on September 15 National Engineers Day is celebrated all over the country.