Mathematics
NULL
Medium
Question
There are 21 equally spaced poles. A car reaches the 16th in 30 seconds. How long to reach the last pole?
A
39 seconds
B
40 seconds
✓ Official correct answer
C
39.38 seconds
D
39.5 seconds
Community credibility
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A
39 seconds
No member explanations yet for this option.
B
40 seconds
No member explanations yet for this option.
C
39.38 seconds
No member explanations yet for this option.
D
39.5 seconds
No member explanations yet for this option.
Explanation
15 gaps take 30 s; 20 gaps take 40 seconds.