Answer:
42 minutes
Step-by-step explanation:
We make sure all units are consistent before we make subtractions.
She spent 2/3 hours reading. 1 hour is 60 minutes, 2/3 hours reading = 2/3 * 60 = 40 minutes
She spent 480 seconds fixing lunch. 1 minute = 60 seconds, 480 seconds = 480/60 = 8 minutes
Hence, she spent 8 minutes fixing lunch and 40 minutes reading.
The number of minutes she spent doing her homework more than sleeping and reading is 90 - 40 - 8 = 42 minutes
Answer:
42 minutes
Step-by-step explanation:
Vivian spent 90 minutes for homework,
2/3 of an hour= 2/3×60=40 minutes (time spent on reading) and
480 seconds ~(480/60) for fixing her lunch
Combined minutes of reading and fixing her lunch= 8+40=48 minutes
Therefore, minutes spent on more on doing homework than fixing lunch and reading= 90-48=42 minute.
