A can do a piece of work in 30 days while B can do it in 40 days. A and B working together can do it in.

(A)

70 days

(B)

42 3/4 days

(C)

27 1/7 days

(D)

17 1/7 days

Question-2

18 km per hour _{=} ________ m/sec

(A)

5 m/sec

(B)

9 m/sec

(C)

180 m/sec

(D)

None of these

Question-3

A can do a piece of work in 12 days and B alone can do it in 15 days. How much time both will take to finish the work ?

(A)

27 days

(B)

6 2/3 days

(C)

6 3/2 days

(D)

7 days

Question-4

A and B can together do a piece of work in 15 days. B alone can do it in 20 days. A alone can do it in

(A)

30 days

(B)

40 days

(C)

45 days

(D)

60 days

Question-5

A car completes a certain journey in 8 hours. It covers half the distance at 40 km/hr and the rest at 60 km/hr. The length of the journey in kilometres is

(A)

350

(B)

384

(C)

400

(D)

420

Question-6

The speed of a boat in still water is 10 km/hr. If its speed down stream be 13 km/hr, then speed of the stream is

(A)

1.5 km/hr

(B)

3 km/hr

(C)

11.5 km/hr

(D)

5.75 km/hr

Question-7

A,B,C together earn Rs.150 per day while A and C together earn Rs.94 and B and C together earn Rs. 76. The daily earning of C is

(A)

Rs.75

(B)

Rs. 56

(C)

Rs.34

(D)

Rs.20

Question-8

A can do a piece of work in 25 days and B can finish it in 20 days. They work together for 5 days and then A goes away. In how many days will B finish the work?

(A)

11 days

(B)

40 days

(C)

15 days

(D)

None of these

Question-9

A train 150 metres long running with a speed of 30 km/hr.Will pass a standing man in:

(A)

18 Seconds

(B)

45 Seconds

(C)

12 Seconds

(D)

5 Seconds

Question-10

The speed of a boat in still water is 2 km/hr. If its speed upstream be 1 km/hr, then the speed of the stream is

(A)

2 km/hr

(B)

3 km/hr

(C)

1 km/hr

(D)

None of these

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