Natalia lives in Amsterdam and leaves home to cycle to a bookstore at a speed of 5 m/s for 7 min to return her books. After 10 min at the bookstore, she cycles to her friend's house at a speed of 4 m/s for dinner. The total distance travelled by Natalia is 7200 m. What is the average speed (to 3 s. f.) for the whole journey in km/h? 3.14 m/s
4.15 m/s
6.12 km/h
11.3 km/h

1 3 5

step-by-step explanation:

i took the test: )

step-by-step explanation:

there are 36 inches in a yard

25 : 36 = 0.69 yards (you can round to 0.70)

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)