The time Shaz takes to run a race is 1 minute 28 seconds less than 2 hours. Work out her time in hours, minutes and seconds.

We need to calculate 2 hours minus 1 minute 28 seconds. Method 1: Subtraction with borrowing We can set up the subtraction like this: 2h 00m 00s - 0h 01m 28s We can't subtract 28 from 0, so we need to borrow. Borrow 1 minute from the minutes column, which gives us 60 seconds. But we have 0 minutes, so we must first borrow from the hours column. 2 hours becomes 1 hour and 60 minutes. So we have: 1h 60m 00s - 0h 01m 28s Now we can borrow 1 minute from the 60 minutes, leaving 59 minutes and giving us 60 seconds. 1h 59m 60s - 0h 01m 28s ------------------ 1h 58m 32s So the time is 1 hour, 58 minutes, and 32 seconds. Method 2: Using seconds 2 hours = 2 * 3600 = 7200 seconds. 1 minute 28 seconds = 60 + 28 = 88 seconds. Time taken = 7200 - 88 = 7112 seconds. Now convert back: 7112 / 3600 = 1 with a remainder of 3512. So, 1 hour. 3512 / 60 = 58 with a remainder of 32. So, 58 minutes. Remainder is 32 seconds. Answer: 1 hour 58 minutes 32 seconds.