# How long did it take Siya to complete her fourth circuit?

38 views

Siya is training for a charity race by running circuits, getting gradually slower. Her first three circuits took her 1 minute 11 seconds, 1 minute 15 seconds and 1 minute 29 seconds. If, after her fourth circuit, her average circuit time is 11 seconds longer than her fastest circuit, how long did it take Siya to complete her fourth circuit?

posted Mar 15

+1 vote

1st circuit = 71 sec
2nd circuit = 75 sec
3rd circuit = 89 sec
4th circuit = x sec

(71 + 75 + 89 + x)/4 = 82
x = 328 - (235) = 93 seconds or 1 minute & 33 seconds.

Similar Puzzles

Three workmen set out to dig a hole.
On his own, Vikram can dig a hole in 18 minutes, Harish can dig a hole in 6 minutes and Mahesh can dig a hole in 5 minutes.
They started to dig this hole together.
Unfortunately, Mahesh had forgotten what he was supposed to be doing and was actually shovelling the dirt back into the hole at the same rate as he could have removed dirt.
Vikram and Harish never noticed this so how long did it take them to dig a hole?

A man is allocated a task. He doubles the task done everyday. If the man completely does the task in 18 days, how many days did it take for the man to complete 25% of the task?

Jay was planning to go to another country to visit relatives. The trip to the airport was long and boring, and since he didn't have a license, his mother had to drive him.

Jay was driven to the airport once from his house when he realized that he forgot his passport at home. His mother went back, got it, then brought it back. He then said he left his wallet at home. She went to get it, came back, and he had some more bad news. He left his cell phone at home. She went to go get it, but exactly halfway back, she found it in the glove compartment. She brought it back to him immediately, and he went off with his flight.

Assuming that the average car speed was 75 kph, the distance between the house and airport was exactly 50 km, and ignoring facts such as U-Turn time, time talking to son at the airport, time getting items, etc, how long did it take for Jay to leave, with the time starting when he left his house?