Teaching DSSSB PRT Special Educator Mock Test Quantitative Aptitude Speed Time and Distance Boat and River
In a stream, the ratio of the speed of the boat in still water and the speed of the stream is 7 : 5. The ratio of the speed of another boat in still water to the speed of the stream is 4 : 3. What is the ratio of the speed of the second boat to that of the first boat in still water?
1
21 : 20
2
20 : 21
3
19 : 11
4
6 : 11