A boat in the direction of flow covers
a distance of 60 km in 4 hr. If speed of
the boat is double the speed of flow,
then how much distance it covers in
2 h opposite the flow?
(a) 10 km (b) 8 km
(c) 11 km (d) 15 km
Answers
Answer:
I think that the answer is (d)
Step-by-step explanation:
Since the boat covers 60 km in 4 hrs
It's speed is 15 kmph
Hence speed of flow is 15/2=7.5 kmph
Now if the boat flows in opposite direction
the net velocity would be 7.5 kmph
Therefore d = st
= 7.5 × 2=15 km
Hope you are satisfied.
Please explain if my answer is wrong..
Answer:
Let the speed of the River be X km / Hour.
Therefore, the speed of the Boat in steady water is 2X km / Hour.
When the Boat is going in the direction of flow of water, the speed of the Boat is X + 2X = 3X km / Hour.
In 3 Hours (with 3X Speed), the Boat will go 12X kms, which has been given to be 60 km.
Since 12X = 60, we get X = 5 km / Hour.
The speed of the Boat in the opposite direction of the River would be 2X - X = X km / Hour.
In 2 Hours, with X km / Hour speed the Boat would go 2*X = 2X km and since X = 5, it would go 2*5 = 10 kms.