14. Trying to be on time for class, a girl moves at 1.4 m/s down a 52 m-long 7 points hallway, 1.8 m/s down a much more crowded hallway that is 79 m long, and
the last 25 m to her class at 2.4 m/s. How long does it take her to reach her
class?

88S

Option (2)

Explanation:

To find the time taken by the girl we will use the formula,

Time =

Time taken by a girl who moves down 52 m long and 1.4 m per second,

= 37.14 sec.

Time taken to move through crowded hallway,

=

sec

Time taken to cover 25 m with speed 2.4 meter per sec,

sec

Total time taken by the girl =

                                             = 37.14 + 43.89 + 10.42

                                             = 91.45

                                             ≈ 91 seconds

Option (2) will be the answer.