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সম্পর্কিত প্রশ্ন সমূহ
A is 30% more efficient than B . How much time will they, working together , take to-complete a job which A alone could have done in 23 days ?
A.
11 days
B.
13 days
C.
21 days
D.
None of these
One pipe can fill a tank three times as fast as another pipe. If together the two pipes can fill the tank in 36 minutes, then the slower pipe alone will be able to fill the tank in :
A.
81 min
B.
108 min
C.
144 min
D.
192 min
A person has to cover a distance of 6 km in 45 minutes. If he covers one-half of the distance in two-thirds of the total time; to cover the remaining distance in the remaining time , his speed (in km/hr ) must be :
A.
6
B.
8
C.
12
D.
15
How may seconds will a 500 meter long train take to cross a man walking with a speed of 3 km/hr in the direction of the moving train if the speed of the train is 63 km/hr ?
A.
25
B.
30
C.
40
D.
45
TK. 800 becomes TK. 956 in 3 years at a certain rate of simple interest. If the rate of interest is increased by 4%, what amount will TK. 800 become in 3 years ?
A.
1020.8
B.
1025
C.
1052
D.
None of these
If $A + B = 2C$ and $C + D = 2A$ , then
A.
A + C = B + D
B.
A + C = 2D
C.
A + D = B + C
D.
A + C = 2B
In a class of 60, where girls are twice that of boys , Kamal ranked seventeenth from the top . If there are 9 girls ahead of Kamal , how many boys are after him in rank ?
A.
3
B.
7
C.
12
D.
23
If $m$ and $n$ are whole numbers such that $m^n = 121$, then the value of $(m-1)^{n+1}$ is :
A.
1
B.
10
C.
121
D.
1000