Maths questions series #4
A policeman spotted a thief 200 meter apart. The thief starts running at the speed of 10km/hr. and e policeman chases him at the respectively 11 km/hr. Then find the distance between them after 6 minute -
(A) 80
(B) 90
(C) 100
(D) 110
Correct Answer : C
A train of length 200 m crosses a platform of which is 50 m more than train in 18 sec. Find the speed of train.
(A) 20 m/s
(B) 25 m/s
(C) 30 m/s
(D) 28 m/s
(E) None of these
Correct Answer : B
Two trains 108 m and 112 m in length are running towards each other on the parallel lines at a speed of 45 km/hr and 54 km/hr respectively. To cross each other after they meet, it will take
(A) 12 sec
(B) 9 sec
(C) 8 sec
(D) 10 sec
Correct Answer : C
Megha invests an amount of Rs. 15,860 in the names of her three daughters A, B and C in such a way that they get the same interest after 2, 3 and 4 years respectively. If the rate of simple interest is 5 % p.a, then the ratio of the amounts invested among A, B and C will be –
(A) 6 : 7 : 8
(B) 6 : 5 : 4
(C) 5 : 10 : 12
(D) $${1\over 10}:{1\over 15}:{1\over 20}$$
Correct Answer : D
A certain sum becomes Rs. 1020 in 5 years and Rs. 1200 in 8 years at simple interest. What is the value of principal?
(A) 700
(B) 720
(C) 820
(D) 780
Correct Answer : B
Out of 5 men and 3 women. committee of 3 members is to be formed so that it has 1 woman and 2 men. In how many different ways can it be done?
(A) 20
(B) 10
(C) 23
(D) 30
(E) None of these
Correct Answer : D
In how many different ways can letters of the word ‘SECOND’ be arranged?
(A) 720
(B) 120
(C) 5040
(D) 270
(E) None of the above
Correct Answer : A
Explanation :
Number of letter in word ‘SECOND’ =6
The number of ways can the letters of word be arranged =6×5×4×3×2×1=720
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