Oracle Company Numerical Ability Boats and Streams

A boat running downstream covers a distance of 10km in 3hr while for covering the same distance upstream, it takes 6hr.
What is the speed of the boat?

Read Solution (Total 3)

speed upstream = 10/3
speed of boat down stream = 10/6
speed of boat = 1/2(10/3 + 10 /6 ) = 2.5 kmph
10 years agoHelpfull: Yes(13) No(1)

let speed of the boat=x
and speed of d stream=y
so speed upstream=x-y speed downstream=x+y
=>10/x+y=3..............(1)
same distance upstream so 10/x-y=6........(2)
=>3x+3y=10
6x-6y=10
solving d above 2 xpression we get x=5/2 or x=2.5(speed of the boat)
9 years agoHelpfull: Yes(3) No(0)
yes 0 is the answer since mutually exclusive events probability is 0
9 years agoHelpfull: Yes(0) No(1)

Oracle Other Question

There are 3 workers in the factory A, B, C. The age of A is 4 more than the age of B and the age of B is 4 more than the age of C. If the sum of the square of the ages is 1202. What is the sum of their ages? Consider the events "it is night" and "it rains" are mutually exclusive events. Find the probability that it rains and it is night if P(it rains)=0.1 and P(it is night)=0.5.