Subject :IMO Class : Class 7
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?
A 20
B 40
C 60
D 30
Ans 1:
Class : Class 7
OPTION:-A) 20 because its simple decrease 2cm from 5cm ans is 3cm therefore, the insect crawls 3cm per second then 60 divided by 3 = 20,therefore ans =20 seconds
Ans 2:
Class : Class 7
OPTION:-A) 20 because its simple decrease 2cm from 5cm ans is 3cm therefore, the insect crawls 3cm per second then 60 divided by 3 = 20,therefore ans =20 seconds
Ans 3:
Class : Class 10
Answer : B
Solution
Insect moved (5 - 2) cm per 2 seconds = 3 cm per 2 seconds
It will move 60 cm in (2/3 x 60) = 40 seconds
Solution
Insect moved (5 - 2) cm per 2 seconds = 3 cm per 2 seconds
It will move 60 cm in (2/3 x 60) = 40 seconds