Question

Anna can text much faster than her mother, Joanna. On average, it takes Joanna two minutes to send a text; on average, Anna takes 40 seconds to send a text. How long will it take the two of them to send a total of 84 texts if they start texting at the same time?

Answer 1

Answer:

42 min

Step-by-step explanation:

Joanna takes 2 mins to send a text.

2 mins = 2 x 60 sec = 120 sec

Anna takes 40 seconds to send a text

120 ÷ 40 = 3

Anna can text 3 messages in 120 sec

Together, in 120 sec ,

both of them can send out 1 + 3 = 4 texts

Number of 120 seconds needed to send 84 texts

= 84 ÷ 4

= 21

Number of seconds needed

= 21 x 120

= 2520

25020 sec = 2620 ÷ 60 min = 42 min