Question

pro 27) A boat with speed 15 km/hr in standing water la goes 30 km downstream and returns in a total of 4.2 hours. What is the speed of current? 10) a. 4 kmph b. 6 kmph 5 kmph d. 8 kmph If wh​

Answer 1

Answer:

30/(15 + x) + 30/(15 – X)] = 9/2

⇒ (450 – 30X + 450 + 30X) / (15 + X) × (15 – X) = 9/2

⇒ 900 = [(152 – X2) × 9/2]

⇒ (900 × 2/9) = 225 – X2

⇒ X2 = 225 – 200

⇒ X2 = 25

⇒ x = 5