Question

Yuvaraj went to a place 11.9 Km upstream and came back from that place in his boat. Total time taken for the entire trip is 6 hours If the speed of the stream is 2 Kmph. find the speed of Yuvaraj's boat in still water. a) 3.6 Kmph c) 5.2 kmph b) 5.6 kmph d) 4.8 kmph​

Answer 1

A boat takes 6 hours to travel 8 km upstream and 32 km downstream and it takes 7 hours to travel 20 km upstream and 16 km downstream. Find the speed of the boat in still water and the speed of the stream

Answer 2

Answer:

D

Step-by-step explanation:

Let the speed in which Yuvraj can row his boat in still water be V kmph

Therefore, 11.9/(V-2) + 11.9/(V+2) = 6.

i.e 2V/(V2 -4) = 6/11.9.

i.e. 6 V2 -23.8V- 24 = 0.

i.e. 6 V2 - (28.8 - 5)v - 24 = 0.

i.e. 6V(V-4.8) + 5(V-4.8) = 0.

i.e. (V-4.8)(6V+5) = 0.

Hence, V = 4.8 kmph.