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The bus driver found a secret staircase that had 10 slippery, slimy steps. It took the drive 1 minute to climb 3 steps, but each time he climbed up 3 steps, he slipped back 2. How long did it take him to reach the top step?

Respuesta :

Answer:

8 minutes.

Step-by-step explanation:

So the first cycle is 3 up and 2 back  therefore in 1 minute he has climbed just 1 step. Then he  will climb to step 4 and drop back to step 2  (2 minutes)

then to 5 back to 3, (3 mins)  6 back to 4 (4 mins) , 7 back to 5 (5 mins) , 8 back to 6 (6 mins), 9 back to 7 ( 7 mins). But after climbing the last 3 he is on the top so will not slip back, so that will be a total of 8 minutes.

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