Question

george rowed a distance of 48 km in still water in 4 hours he rowed 60km in 3 hours with the current find the time he would take to 30 km find stream​

Answer 1

Answer: $7\frac{1}{2}hr$

Step-by-step explanation:

• Given,Speed of boat in still water=$\frac{48}{4}km/hr$=12km/hr
• Also,George rowed 60 km in 3 hrs with the current.
• So,net speed of the boat with the current=$\frac{60}{3}km/hr$=20km/hr
• If the speed of boat in still water is 12km/hr then the speed of current=(20-12)km/hr

                    =8km/hr  

• If he has to row 30 km against the stream then resultant speed will be=(12-8)km/hr

                   =4km/hr

• ∴ Time required=$\frac{30}{4}hr$

                                   =$7\frac{1}{2}hr$

• Hence,time required to go 30km against the current is $7\frac{1}{2}hr$.