Question

In 1990, Gary Stewart of California set a world record by making 177,737 consecutive jumps on a pogo stick in 20 hours 20 minutes. If he began at 10:30 AM, on Tuesday, at what time did he stop?

Answer 1

He stopped on Wednesday at `06:50`

Explanation:

We can do this by adding the time taken for the jumps
to the starting time.

`color(white)(xxxxx)10:30`
`color(white)(xx.x)ul(+20)color(white)(.)ul20`
`color(white)(xxxxx)30:50" "larr` this is more than 24 hours. It means that
`color(white)(xx.x)ul(-24)color(white)(xxxxx.xxx)`the time has gone past midnight and
`color(white)(xxx.x)06:50color(white)(xxxxxx)`it is now Wednesday, Subtract 24 hours.

He stopped on Wednesday at `06:50`

(This can also be given in 12 hour time as 6:50a.m.)

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Another method is by "counting on"

`10:30 rarr 11:00` is 30 mins, leaving `" "19" hours "50 " mins"`
`11:00 rarr 12:00` is 1 hour, leaving `" "18 " hours "50 " mins"`
`12:00 rarr 24:00` is 12 hours leaving `" " 6 " hours "50 " mins"`
`24:00 rarr 06:50` is 6 h 50 mins leaving `0 "hrs"`

He stopped on Wednesday at `06:50`