Maths questions series #4

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Q :  

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

Q :  

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

Q :  

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

Q :  

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

Q :  

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

Q :  

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

Q :  

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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