CBSE Class 8 Answered
A boat goes downstream and covers the distance between two ports in 96 minutes while it covers the same distance upstream in 120 minutes . If the speed of the stream is 1 km/h ,find the speed of the boat in still water
Asked by Advdeeptisingh22 | 17 Feb, 2019, 09:17: PM
Expert Answer
Let S be the distance between the two ports.
Let u km/hr be the speed of boat in still water.
downstream time to travel = distance/time = S/(u+1) = 96 or S = 96(u+1) ........................(1)
upstream time to travel = S/(u-1) = 120 or S = 120(u-1) ........................(2)
By equating (1) and (2), 96(u+1) = 120(u-1) ..............(3)
From eqn.(3), we get u = 9 km/hr
Answered by Thiyagarajan K | 18 Feb, 2019, 12:20: AM
Application Videos
-
Solving Linear Equations in one variable
This video explains the method of finding the solutions of given linear equ... -
Linear Equations to Simpler Form
This video explince the concept of Linear Equations to Simpler Form. -
Equations Reducible to the Linear Form
This video explains the concept of Equations Reducible to the Linear Form. -
Sum of the Measures of the Exterior Angles of a Polygon ...
This video explains the method of finding number of sides of a polygon if t... -
Grouped Frequency Distribution Table
This video explains the method of constructing the Grouped Frequency Distri...
Concept Videos
-
Construction of Rhombus
Construction of rhombus given side and angle, both diagonals -
Construction of squares and rectangles
construction of square given side and diagonals,construction of rectangles -
Quadrilaterals
Definition, elements, angle sum property, classification of quadrilaterals -
Surface Area: Cubes and Cuboids
cubes and cuboids, finding their surface area -
Bar Graphs and Histograms
bar graph, histogram their interpretation,comparison of the two
CBSE 8 - Maths
Asked by biswajitpatel88 | 10 May, 2024, 10:49: AM
ANSWERED BY EXPERTCBSE 8 - Maths
Asked by biswajitpatel88 | 10 May, 2024, 10:49: AM
ANSWERED BY EXPERTCBSE 8 - Maths
Asked by seemachaubey1987 | 05 May, 2024, 09:41: AM
ANSWERED BY EXPERTCBSE 8 - Maths
Asked by ptech3383 | 04 May, 2024, 06:10: PM
ANSWERED BY EXPERTCBSE 8 - Maths
Asked by sarkarchaitali4001 | 02 May, 2024, 04:11: PM
ANSWERED BY EXPERTCBSE 8 - Maths
Asked by jaiswal445512 | 01 May, 2024, 05:42: AM
ANSWERED BY EXPERTCBSE 8 - Maths
Asked by jigmetyangchen13 | 28 Apr, 2024, 02:33: PM
ANSWERED BY EXPERTCBSE 8 - Maths
Asked by chauhannaman12b | 25 Apr, 2024, 09:33: PM
ANSWERED BY EXPERTCBSE 8 - Maths
Asked by gk9941740 | 23 Apr, 2024, 05:13: PM
ANSWERED BY EXPERT
