An insect crawls up $5$ cm every second on a $60$ cm vertical rod and then falls down $2$ cm over the next second. How many seconds will it take to climb the rod?

20

seconds

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39

seconds

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60

seconds

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30

seconds

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Solution

The correct option is D $39$ seconds
For every $2$ seconds insect climbs $5 - 2 = 3$ cm
Therefore in $38$ seconds it will climb $38 \times 2 = 57$ cm
On $39$ second it will climb up $5$ cm more than previous one. $57 + 5 = 62$ cm
So total $39$ seconds would be required by insect to climb the rod.

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An insect crawls up 5cm every second on a 60cm vertical rod and then falls down 2cm over the next second. How many seconds will it take to climb the rod?

The correct option is D 39 secondsFor every 2 seconds insect climbs 5−2=3 cmTherefore in 38 seconds it will climb 38×2=57 cmOn 39 second it will climb up 5 cm more than previous one.57+5=62 cmSo total 39 seconds would be required by insect to climb the rod.

An insect crawls up $5$ cm every second on a $60$ cm vertical rod and then falls down $2$ cm over the next second. How many seconds will it take to climb the rod?

The correct option is D $39$ seconds
For every $2$ seconds insect climbs $5 - 2 = 3$ cm
Therefore in $38$ seconds it will climb $38 \times 2 = 57$ cm
On $39$ second it will climb up $5$ cm more than previous one. $57 + 5 = 62$ cm
So total $39$ seconds would be required by insect to climb the rod.