L&T Company Numerical Ability Time Distance and Speed

Two trains, each 120 m long, moving in opposite directions, cross each other in 12 seconds. If one is moving twice as fast the other, then the speed of the faster train is:
A. 24 B. 60 C. 48 D. 36

Read Solution (Total 1)

Let the speed of the slower train be x m/sec.

Then, speed of the faster train = 2x m/sec.

Relative speed = (x + 2x) m/sec = 3x m/sec.
==> (120 + 120)/12 = 3x
==> x=20/3
==>So, speed of the faster train =40/3m/sec
==> (40/3)*(18/5)
==> 48 km/hr.
5 years agoHelpfull: Yes(0) No(0)

L&T Other Question

Brian is dividing 50 marbles into 3 groups. How many marbles are in the largest of the three groups?
(1) The sum of the two smaller groups of marbles is equal to the largest group of marbles.
(2) The smallest group contains 6 marbles

A. Statement (1) ALONE is sufficient, but statement (2) is not sufficient.
B. Statement (2) ALONE is sufficient, but
statement (1) is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient. A present age of a person is one-third of the age of his mother. After 16 years, he will be one-half of the age of his mother. How old is the mother at present?
[A] 54 [B] 48 [C] 64 [D] 32