Each of 200 runners ran nonstop for 45 seconds. After the 1 st runner, each runner began to run when the previous one had run for 15 seconds. How much time elapsed between the time the 1st runner stopped running and the time the last runner stopped running?
A.
2985 sec .
B.
5970 sec .
C.
8940 sec .
D.
8955 sec .
Exam No：2021 First Round Grade 7 Year：2021 Question No：21
Answer:
A
Knowledge points:
G7 - Algebra - Arithmetic Sequences (Sum & Terms)
Solution:
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