Mathmetics
ISBT Mathmetics for all banking PO,Clerk,IBPS PO,Railway,SSC,IAS,OAS Exams
Q11. |
|
| 1) | 8.5 km/hr | 2) | 9 km/hr |
| 3) | 10 km/hr | 4) | 12.5 km/hr |
| 5) | None of these | ||
Answer : 10 km/hr
Explanation :
Explanation :
Man's rate in still water = (15 - 2.5) km/hr = 12.5 km/hr.
Man's rate against the current = (12.5 - 2.5) km/hr = 10 km/hr.
View AnswerQ12. |
|
| 1) | 2 hours | 2) | 3 hours |
| 3) | 4 hours | 4) | 5 hours |
| 5) | None of these | ||
Answer : 4 hours
Explanation :
Explanation :
Speed downstream = (13 + 4) km/hr = 17 km/hr.
Time taken to travel 68 km downstream = ( 68/17) hrs = 4 hrs.
View AnswerQ13. |
|
| 1) | 20 km/hr | 2) | 22 km/hr |
| 3) | 24 km/hr | 4) | 28 km/hr |
| 5) | None of these | ||
Answer : 22 km/hr
Explanation :
Explanation :
Let the speed of the man in still water be x km/hr. then,
km/hr.
10/(x-2) + 10/(x+2) = 55/60
or x = 22 km/hr
View AnswerQ14. | A boat running downstream covers a distance of 24 kms in 4hrs while for covering the distance upstream it takes 6 hrs. What is the speed of the boat in still water ? |
| 1) | 5.5 km/hr | 2) | 6 km/hr |
| 3) | 3.5 km/hr | 4) | 4.5 km/hr |
| 5) | None of these | ||
Answer : None of these
Explanation : Ans. 5 km/hr
Explanation : Ans. 5 km/hr
View Answer