An insect crawls up 5 cm every second on a 60 cm vertical rod and then

1.	An insect crawls up 5 cm every second on a 60 cm vertical rod and then falls down2 cm over the next second. How many seconds will it take to climb the rod?
Answer» Every two seconds, the insect climbs up 3 cm In 30 seconds, the insect climbs up 153 = 45 cm In 36 seconds, the insect climbs up 183 =54 cm In 38 seconds, the insect climbs up 19*3 = 57 cm Now, in the next second it will climb up 5 cm. Total distance climbed up by the insect in 39 seconds = 57 + 5 = 62 cm Total time taken = 39 seconds

An insect crawls up 5 cm every second on a 60 cm vertical rod and then falls down2 cm over the next second. How many seconds will it take to climb the rod?

Answer»

Every two seconds, the insect climbs up 3 cm

In 30 seconds, the insect climbs up 15*3 = 45 cm

In 36 seconds, the insect climbs up 18*3 =54 cm

In 38 seconds, the insect climbs up 19*3 = 57 cm

Now, in the next second it will climb up 5 cm.

Total distance climbed up by the insect in 39 seconds = 57 + 5 = 62 cm

Total time taken = 39 seconds