158k views
5 votes
Last night, Roberto spent 90 minutes doing homework, 2/3 hour reading, and 540 seconds making his lunch for the next day. How many more minutes did Roberto spend doing homework than he did reading and making his lunch?

User Darcamo
by
7.7k points

1 Answer

5 votes

Answer:

41

Explanation:

Ok, so the time for homework is already simplified to minutes.

2/3 of an hour is x/60

60/3 = 20

20*2 = 40

so 2/3 = 40/60

40/60 = 40 minutes

[]

540 seconds is..

540/60

54/6=9

9 minutes

[]

40+9 = 49

90-49 = 41

So, he spent 41 more minutes on homework than on making lunch and reading.

User LanDenLabs
by
9.0k points

No related questions found