Question
A goods train and a passenger trains are running on
parallel tracks in the same direction.The driver of the goods train observes that the passenger train coming from behind overtakes and crosses his train completely in 50 seconds. Whereas a passenger on the passenger train marks that he crosses the goods train in 20 seconds. If the speed of the trains be in the ratio of 1:3, find the ratio of their lengths?Solution
Suppose the speeds of the two trains x m/sec and 3x m/sec respectively. Also, suppose that the lengths of the two trains are A m and B m respectively. Then, ((A+B)/(3x - x)) = 50    ……………….. (i) and (A/(3x - x)) = 20      ……………… (ii) Dividing (i) by (ii), we get ((A+B)/A) = 50/20 B/A + 1 = 5/2 B/A = 3/2 or A:B = 2:3
In the following question, a group of letters is given. The letters of each group are related with the letters of the same group by some Logic/Rule/Rela...
What will come in the place of ‘?’ in the following equation, if ‘+’ and ‘÷’ are interchanged and ‘×’ and ‘–’ are interchanged?<...
Three of the following four are alike in a certain way and thus form a group. Which is the one that does NOT belong to that group?
(NOTE: Operati...
Select the Venn diagram that best illustrates the relationship among the following classes.
Females, Relatives, Uncles
Which of the following letter-clusters will replace the question mark (?) in the given series to make it logically complete?
ZXV, TRP, NLJ, HFD, ?
A, B, C, D, E, F and G are sitting in a straight line facing north. C sits third to the right of B. A sits second to the right of C. G is an immediate n...
Ramdin started from his office and walked 15 km in the south direction and reached the bus stop, and then turned to his left and walked 8 km straight on...
If 12th Dec 2009 is a Saturday, then what will be the day of the week on 16th Dec 2014?
10 is related to 15 following certain logic. Following the same logic, 42 is related to 63. To which of the following numbers is 22 related, following t...
What should come in place of? in the given series based on the English alphabetical order?
UDM, XGP, AJS, DMV, ?
Relevant for Exams:
