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Two trains starting at the same time from two stations 200 km apart, and going in opposite directions cross each other at a distance of 110 km from one of the stations. What is the ratio of their speeds?

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In the same time ,they cover 110 km and 90 km respectively
Ratio of their speeds=110:90 = 11:9
10 years agoHelpfull: Yes(0) No(0)

self Other Question

Q. Engineer k visually inspected 1000 microchips for surface flaws and found flaws in 37 of them. Engineer H inspected the same microchips and found flaws in 43 of them. A total of 948 microchips were found to be flawless by both engineers. One of the 1000 microchips is selected at random.
1) Find the probability that a flaw was found in his microchip by at least one of the engineers
2) Find the probability that flaws were found in this microchip by both engineers
3) Find the probability that flaw was found by engineer k but not by engineer H Q. Find (7x + 4y ) / (x-2y) if x/2y = 3/2?
Ans = 7 But how ?

Option
(a) 6
(b) 8
(c) 7
(d) data insufficient