Question

a steamer goes down from one point to another is 7 hours . it covers same distance up stream is 8 hours . if the speed of stream be 2 km per hour . find the speed of stream in still water at the distance between the ports

Answer 1

this is way to use camera

now come to the question

let  the speed of streamer be x

speed of stream=2km/hr

the time taken by streamer to go upstream=8 hours

the time taken by steamer to go downstream= 7 hours

speed of streamer going upstream=8(x-2)

speed of streamer going downstream=7(x+2)

speed of streamer is 8(x-2)=7(x+2)

8x-16=7x+14

x=30

speed of streamer = 30km/hr, so,distance=8(30-2)=240-16 = 224 or

7(30+2)=210+14=224

speed of streamer in still water=30km/hr and distance=224/kms

hope it helps