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2 .A hare sees a dog 100 metres away from her and scuds off in the opposite direction at a speed of 12 km per hr. A minute later the dog perceives her and chases her at a speed of 16 km per hr. At what distance from the spot dog will overtake the hare when the hare took flight ?

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3 .A train met with an accident 3 hours after starting, which detains it for one hour, after which it proceeds at 75% of its original speed. It arrives at the destination 4 hours late. Had the accident taken place 150 km further along the railway line, the train would have arrived only 3$1\over2$ 2 hours late. Find the length of the trip and the original speed of the train

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4 .A motorboat in still water travels at a speed of 36 kmph. It goes 56 km upstream in 1 hour 45 minutes. The time taken by it to cover the same distance down the stream will be â€“

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5 .

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6 .

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7 .the value of $1\over20$+$1\over30$+$1\over42$+$1\over56$+$1\over72$+$1\over90$ is ---

A.$31\over10$

B.$3\over5$

C.$3\over20$

D.$7\over20$

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8 .(x+$1\over x$)(x-$1\over x$)($x^2$ + $1\over x^2$ -1)($x^2$ + $1\over x^2$ +1) is equal to --

A.$x^6$ + $1\over x^6$

B.$x^8$ + $1\over x^8$

C.$x^8$ - $1\over x^8$

D.$x^6$ - $1\over x^6$

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9 .The value of the expression

$(a-b)^2\over (b-c)(c-a)$+ $(b-c)^2\over (b-c)(c-a)$+ $(c-a)^2\over (b-c)(c-a)$ is --

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10 .If a+ b+ c= 2s, then $(s-a)^2+(s-b)^2+(s-c)^2+(s-d)^2+d^2\over a^2+b^2+c^2$ is equal to â€“

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