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Mathematics: Post your doubts here!

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Ummmm..............can anyone help me with moi doubt: (The paper is w07 qp 4)

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The marking scheme says that s1 + s2 = 10, I dont get that................. I came to the conclusion that it would be s1 - s2 = 10................ so can anyone explain why it is like that? :D
 
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Can someone give me the solution for the second part of this question? The answer is 16km.
 

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Can someone give me the solution for the second part of this question? The answer is 16km.

Did you round off or some stuff? Cause I'm getting an answer close to it (15.7km). Btw I do not believe we get this in cambridge examinations( especially because neither integration/differenciation nor applying motion equations is to be required)

Edit: What i did was, displacement of bird=displacement of car 1.
Displacement= 16*40/41=15.6km
40/41 is the time taken for car1 to meet car2.
 
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3. The random variable X is normally distributed with mean µ and variance 21.0. Given that P(X > 10.0) = 0.7389,(w06_6) find the value of µ.please help me out with this problem anyone! aren't we supposed to use (X-mean)/sd but the answer came wrong!
 
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