(A) 40 mins is my answer

1st we cut all of them but at the 8th piece, we divide it it turn out that the 9th piece had cut right when we cut the 8th piece off

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The number of cabins at the bottom of the wheel is :

32 - 14 = 18( cabins )

Ans: 18 cabins 

If 180 students don't have a younger sibling the number of students who have younger siblings is :

180 : 5 x 6 = 216 ( students ) 

Ans : 216 students

A level road of length 16 km links A to B.From B,the road goes uphill to C. Kelly and Kerry both ride their bikes at 8 km/h on level roads,5 km/h uphill and 10 km/h downhill.Kelly goes from A to C.Kerry goes from C to A.They meet at a point on the level road 4 km from B.They continue to their respective destinations and turn around immediately.Where will they meet the second time ?

They will meet each character at B

First they met at 4km away from B \(\rightarrow\) it took 1h30m to go 'cause on level roads Kelly went at 8km/h and Kelly had gone 16 - 4 = 12 km and 12km : 8km/h = ​1.5h ​\(\rightarrow\) 90m.

Kerry also went the 4km left and it takes 30m too. So the time Kerry had spent was 1h30m - 30m = 1h and the length of B to C is: 10km/h x 1 = 10 (km) 

Then they are continuing to their respective destinations, Kerry go to A and turn around takes : 12km : 8km/h = 1.5h\(\rightarrow\) 90m. Kelly go to B takes: 4km : 8km/h = 0,5h \(\rightarrow\)30m, Kelly go to C takes: 10km : 5km/h = 2h. At that time Kerry has gone half way to B. Kelly turn around and go back, it take 1 hour for Kelly to go down = 10km : 10km/h = 1h. So Kerry will go to B right on Kelly go to B 'cause 8km : 8km/h = 1h