Along distance runner does a first lap around a track in exactly 50 seconds. as she tires. each subsequent lap takes 20% longer than previous one. how long does she take to run 3 laps?

182 seconds

Step-by-step explanation:

Given:

Time taken for first lap is 50 seconds and each subsequent lap takes 20% longer than previous

Solution:

Time taken for first lap = 50 sec

For second lap

Each subsequent lap takes 20% longer than previous

Previous lap time = 50 sec

second lap = 50 + 20% of 50

second lap

second lap

second lap

For third lap

Each subsequent lap takes 20% longer than previous

Previous lap time = 60 sec

Third lap = 60 + 20% of 60

Time taken for 3 laps is equal to sum of all three laps time.

Therefore, it takes 182 seconds (3 min, 2 seconds) to run three laps

the answer will be b x² +x-1

step-by-step explanation:

b