SOLUTION: Joann took 20 minutes to drive her boat upstream, coming back at the same boat speed, it took her 15 minutes. If the current in that part of river is 5 km per hr, what was her boat

Question 27513: Joann took 20 minutes to drive her boat upstream, coming back at the same boat speed, it took her 15 minutes. If the current in that part of river is 5 km per hr, what was her boat speed?
Thank YOU!
Answer by Paul(988) (Show Source): You can put this solution on YOUR website!
20 minutes = 1/3hours
15 minutes = 0.25hours.

--> multiply the whole eqution by 3

-0.25=-8.75
x=35

Hence, the speed of the boat was 35mph.
Paul.

RELATED QUESTIONS
Joann took 20 miuntes to drive her boat upstream to water-ski at her favorite spot.... (answered by gonzo)

Callie took 20 min to drive her boat upstream to water ski at her favorite spot. Coming... (answered by ewatrrr)

Jane took 10 minutes to drive her boat upstream to water ski at her favorite spot. Coming (answered by richwmiller)

JOan took 20 min to drive her boat upstream to water ski at her favorite spot. Coming... (answered by checkley75)

Joseph took 20 minutes to drive his boat upstream to his favorite fishing spot. Coming... (answered by mananth)

Jane took 15 min to drive her boat upstream to water-ski at her favorite spot. Coming... (answered by jorel1380,josmiceli,MathTherapy)

Jane took 15 min to drive her boat upstream to water-ski at her favorite spot. (answered by josgarithmetic,josmiceli,MathTherapy,greenestamps)

Jane took 30 min to drive her boat upstream to water-ski at her favorite spot.... (answered by mananth)

Jane took 15 min to drive her boat upstream to water ski. Coming back later, at the same... (answered by vksarvepalli)