Question

A team of 4 students is running in a 400-meter relay race. The first 3 runners had times of 14.7 seconds, 16.2
seconds, and 15.3 seconds. What time must the 4th runner beat in order for the total to be less than 60
seconds?

Answer 1

The fourth runner must beat a time of 13.8 seconds for the total time to be less than 60 seconds

Time taken for the first three runners = 14.7seconds, 16.2seconds, 15.3seconds

Let the time spent by the 4th runner be x

Total time = 14.7 + 16.2  +  15.3  +  x

Total time = 46.2 + x

Total time  <  60

46.2  +  x   <   60

x   <   60  -  46.2

x  <   13.8

The fourth runner must beat a time of 13.8 seconds for the total time to be less than 60 seconds

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