241 .

What is the speed of a boat in still water?

I. The boat covers 12 km in 2 hours downstream.

II. The boat covers the same distance in 4 hours upstream.

III.The speed of the stream is one-third that of the boat in still water.

What is the speed of a boat in still water?

I. The boat covers 12 km in 2 hours downstream.

II. The boat covers the same distance in 4 hours upstream.

III.The speed of the stream is one-third that of the boat in still water.

A.Only II

B. Both I and II

C. I and either II or III

D.All I, II and III

E.None of these

View AnswerAns: I and either II or III
242 .

$ \sqrt{7921} * 51 + 374 = ?^3 $

$ \sqrt{7921} * 51 + 374 = ?^3 $

A.17

B. 19

C. 21

D.23

E.None of these

View AnswerAns: None of these
243 .

A car takes 5 hrs to cover a distance of 300 km. How much should the speed in km/hr be maintained to cover the same distance in 4/5th of the previous time ?

A car takes 5 hrs to cover a distance of 300 km. How much should the speed in km/hr be maintained to cover the same distance in 4/5th of the previous time ?

A.60 km/hr

B. 65 km/hr

C. 70 km/hr

D.75 km/hr

E.None of these

View AnswerAns: 75 km/hr
244 .

What is the ratio of the total number of passed students to total number of students not passed for the year 2007 ?

What is the ratio of the total number of passed students to total number of students not passed for the year 2007 ?

A.3:19

B. 19:3

C. 13:131

D.131:13

E.None of these

View AnswerAns: None of these
245 .

What is the average number of candidates not passed from class VII over the given years ?

What is the average number of candidates not passed from class VII over the given years ?

A.9

B. 11

C. 13

D.15

E.17

View AnswerAns: 11