If a boat running upstream takes 7 hours to cover a certain distance, while it takes 4 hours to cover the same distance running
downstream, then the ratio between the speed of the boat to the speed of the water current is
Answers
Answer:
9hr 48 min=9+(48/60)=9+(4/5)=49/5 hr.
So the ratio of time in going upstream to down stream is (49/5):7=(7/5). In covering the constant distance for the two different speeds has the time ratio has a Reciprocal relationship with the speed ratio,hence the up stream speed to down stream speed is as {1÷(7/5)}=(5/7)={(v-u)/(v+u)},where v and u have the usual notion as for speed of boat in still water and the speed of river water flow respectively. So by addendo dividendo formulae for ratio proportion gives v/u as (12/2)=6:1.Ans…
Step-by-step explanation:
9hr 48 min=9+(48/60)=9+(4/5)=49/5 hr.
So the ratio of time in going upstream to down stream is (49/5):7=(7/5). In covering the constant distance for the two different speeds has the time ratio has a Reciprocal relationship with the speed ratio,hence the up stream speed to down stream speed is as {1÷(7/5)}=(5/7)={(v-u)/(v+u)},where v and u have the usual notion as for speed of boat in still water and the speed of river water flow respectively. So by addendo dividendo formulae for ratio proportion gives v/u as (12/2)=6:1.Ans…
7:4
Step-by-step explanation:
because First is 7 hours and second is 4 hours