Question

1. find how much time has passed between the times in bold (intervals are not shown to scale).

a)
time elapsed:

Explanation:

Step1: Calculate time from 1:40 to 2:00

From 1:40 to 2:00, the minutes passed: \( 60 - 40 = 20 \) minutes.

Step2: Calculate time from 2:00 to 4:00

From 2:00 to 4:00, the hours passed: \( 4 - 2 = 2 \) hours, which is \( 2\times60 = 120 \) minutes.

Step3: Calculate time from 4:00 to 4:05

From 4:00 to 4:05, the minutes passed: \( 5 - 0 = 5 \) minutes.

Step4: Sum all the minutes

Total minutes: \( 20 + 120 + 5 = 145 \) minutes. Convert 145 minutes to hours and minutes: \( 145\div60 = 2 \) hours with a remainder of \( 25 \) minutes (since \( 2\times60 = 120 \), \( 145 - 120 = 25 \)). So total time elapsed is 2 hours and 25 minutes.

Answer:

2 hours and 25 minutes (or 145 minutes)