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In a km race, A beats B by 28 metres or 7 seconds. Find A's time over the course.
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- A beats B by 28 metres or 7 seconds, it means B take 7 sec to complete 28 m
Therefore, Speed of B = 28/7 = 4 m/s
Now, Time taken by B to complete 1000m(or 1km) will be:
= 1000/4
= 250 sec.
So,
Time taken by A is 7 less than B
So, Time taken by A = 250-7
= 243 sec. - 12 years agoHelpfull: Yes(54) No(0)
- since B's time over the course=(7/28)*1000=250sec
hence, A's time over the course=250-7=243sec - 12 years agoHelpfull: Yes(2) No(0)
- velocity of b=28/7=4m/s
time taken by b=1000/4=250s
but a beats b by 7 seconds,
time taken by a=250-7=243s - 12 years agoHelpfull: Yes(2) No(0)
- velocity of a=28/7=4m/s
time taken=1000/4=250s - 12 years agoHelpfull: Yes(1) No(1)
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