Question

সহগৰ মাজত সম্পর্ক সত্যাপন কৰা।
6.A motor boat whose speed is 18 km/h in still water takes 1
hour more to go 24 km upstream than to return downstream
to the same spot. Find the speed of the stream.​

Answer 1

Answer:

24km/hr

Step-by-step explanation:

the stream speed is 24 km/hr

Answer 2

Let the speed of the stream be x km\hr.

The speed of the boat upstream = (18 - x) km/hr

The speed of the boat downstream = (18 + x) km/hr

Distance = 24 km

As given in the question,

Time for upstream = 1 + Time for downstream

24/(18 - x) = 1 + 24/(18 + x)

24/(18 - x) - 24/(18 + x) = 1

x2 + 48x - 324 = 0

(x + 54)(x - 6) = 0

x ≠ - 54 as speed cannot be negative.

x = 6

The speed of the stream = 6 km/hr