A boat can travel with a speed of 19 km/hr in still water. If the speed of the stream is 7 km/hr, find the time taken by the boat to go 117 km downstream.

Options
- 2.5 hr
- 3.5 hr
- 4.5 hr
- 5.5 hr

CORRECT ANSWER : 4.5 hr

Discussion Board
Solution

Discussion Board
Solution

Given details ,
x = 19kmph
y = 7kmph

STEP 1 = Find speed of downstream ,we don''t need upstream.
downstream speed S''''d = {x+y } = {19+7} = 26.
STEP 2 ,
Use the Time of downstream formula and substitute it
Formula = distance of downstream/ speed of downstream
= 117 / 26
= 4.5hours.
Mail me if you have any doubts gkaakash@yahoo.com


GK Aakash 07-30-2021 09:17 AM

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