Solve for t in d = rt, if d = 57 and r = 30.
2 answers:
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ANSWER
EXPLANATION
The sum of an arithmetic sequence whose first term and last terms are known is calculated using
From the given information, the first term of the series is
and the last term of the series is
The sum of the first 26 terms is
Given:
An athlete who makes laps in 3 mins 45 seconds on a 400m field.
To find:
The speed of the athlete in m/s.
Solution:
We know that,
Distance covered in 1 lap = 400 m
Distance covered in laps =
m
= m
= m
We know that,
1 minute = 60 seconds
3 minutes = 180 seconds
3 minutes 45 second = 180 + 45 seconds
= 225 second
The speed of the athlete is:
Therefore, the speed of the athlete is about 8.44 m/s.