emojishop3
Answered

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Hannah runs down the street to catch her bus. She runs for a total of 12 seconds. On the sidewalk, she runs 16 feet per second. When she crosses the street, she runs 3 feet per second. Hannah runs a total distance of 127 feet.


How many seconds did Hannah spend running on the sidewalk? Enter your answer in the box.

Sagot :

NonchalantJuliianne

Answer:

7 seconds on the sidewalk and 5 seconds across the street.

Step-by-step explanation:

16 × 5 = 112

3 × 5 = 15

112 + 15 = 127

Answer:

7 seconds that Hannah runs on the side walk

Step-by-step explanation:

let's A is the second that Hannah runs on the side walk.
and B is the second that Hannah runss on the cross street. Base on the information we have 2 equations for 2 unknowns .
A + B = 12
16 A + 3 B =  127  simply to add/subtract column we have
=> 16A + 3B  = 127 (1)
      3A + 3B = 36  (2)  runs on the side walk.
And 12-7 =5 seconds is the time that Hannah runs on the cross street.

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