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a train moves past a telegraph post and bridge 264 m long In 8 seconds and 20 seconds respectively. what is the speed of the train?

trains topic explanation ?

At what rate percent per annum simple interest will a sum of money double itself in 8 years?

A takes twice as much time as B & thrice as much time as C to finish a piece of work. Working together, they can finish the work in 2days. The number of days required by B to do the work alone is......?

P & Q do a piece of work in 20 days. P has worked for 15 days ;Q finished the remaining work in 21 days. In how many days P can do alone?

A takes twice as much time as B & thrice as much time as C to finish a piece of work. Working together, they can finish the work in 2days. The number of days required by B to do the work alone is......?

The difference between compound interest and simple interest on a sum for 2 year at 20% per annum is Rs 200. If the interest is compounded halfyearly, then what is the difference (in Rs) between compound and simple interest for 1st year?

x-1/x=3
find
x^4-1/x^4.

HOW MANY 4 DIGIT NO.CAN BE MADE WITH THE DIGITS 1,2,3,4,5,6,7 DIVISIBLE BY 25 ONLY ONCE?

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ABCD is a rectangle with AD being longer side.P and Q be the mid-points of AB and CD.x is a point on AD.Then what is the ratio of Area of PQCB to XCB?
a)DQ=PB
b)AP=CQ