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When two trains cross each other, they cover distance equal to the sum of their lengths with relative speed. Let's take length of each train = x So, total length of both trains = 2x Relative speed = (70 – 40) × (5/18) = 25/3 m/sec. ∴ Total length = Time × Relative speed ⇒ 2x = (30 × 25)/3 ⇒ x = 125 m
The ratio of the present ages of Ginni and Binni is 12:5 respectively. Ginni is ‘n’ years older than Binni. If after 6 years, the ratio of the ages ...
In a classroom there are 15 boys and 13 girls. Average age of each boy and each girl is 21 years and 17 years respectively. The sum of ages of all the b...
A is younger than B by 2 years. If the ratio of A and B ages is 8:9 respectively, then find the age of A.
12 years ago, the ratio of the ages of Ivan and Jenny was 2:1. The present age of Carl is 18 years more than one-sixth of Jenny’s present age. Find th...
Today is Reena’s birthday. She has turned 34. Reena is twice as old as Deepa was when Reena was as old as Deepa is now. How old is Deepa now?
Shruti is currently 20% younger than Suhana. In four years, the age difference between them will change so that Suhana’s age will be to Shruti’s age...
A lad was asked his age by his friend. The lad said “The number you get when you subtract 25 times my age from twice the square of my age wi...
Four years ago, the age of 'P' was 25% less than the current age of 'Q'. 9 years ago, the average age of 'Q' and 'R' was 25 years. To find the current a...
The ratio of present ages of 'X' and 'Y' is 4:9, respectively. The difference between the ages of 'X' and 'Y' is 25 years. If the present age of 'Z' is ...
