A man starts climbing a hill. Every minute he ascends 20 meters but slips down 5 meters. How long will he take to ascend a point 80 meters high?
Answers
Answer:
Therefore, he takes 5 minutes and 20 seconds.
Step-by-step explanation:
Every minute, the man ascends 20 meters but slips down 5 meters.
Subtracting his descent from his ascent will give the total ascent.
20 - 5 = 15 meters.
Therefore, he is ascending 15 meters every minute.
We can try find how many seconds he takes to ascend each meter and convert that into minutes.
15 meters per minute means that he ascends 15 meters per 60 seconds.
We can divide by 15 to find the amount of seconds taken to ascend one metre. This means that he ascends 1 meter every 4 seconds.
Therefore, he ascends 80 meters in 80 x 4 seconds.
He ascends 80 meters in 320 seconds.
Dividing 320 by 60 to convert this into minutes, we get 5 as the quotient and 20 as the remainder.
The quotient is taken as the whole number of minutes and the remainder is taken as the seconds.
Therefore, he takes 5 minutes and 20 seconds.