Question

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- Please show steps

Answer 1

Answer:

8km/hr

Step-by-step explanation:

if this qn for competitive exams solve like this

downstream= boat speed+current speed

upstream=boat speed - current speed

so just verify the option upstream time is 4 hrs

option 1) upstream=18-8=10km/hr

              distance=time×speed=40km

check this for downstream=18+8=26km

             time=distance/time=40/26=20/13

so option 1 is correct answer

hope you understand

mark as brainliest answer