A ladder has 10 steps.A labourer has to carry some weight to the top. He climbs the ladder 2 steps up in one second and 1 step down in the next second by dancing on a famous tune. In how many seconds he would reach the top.
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No. of steps is 10
Climbs up 2 steps in 1 sec & down 1 step in 1 sec.
he climbs from 1 to 3 in 1sec and comes down to 2 in 1sec
time take by to climb 2 steps is 4sec
1step in 4/2sec = 2sec
time he takes to climb 10 steps
= 10 X 2
= 20seconds
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