Question
A boat running downstream covers a distance of 50 km in
2(1/2) hrs and the same distance upstream in 10 hrs. What is the speed of the boat in still water?Solution
Let the speed of boat in still water be x km/hr Speed of the stream = y km/hr Now, speed downstream (u) = (x + y) km/hr, and Speed upstream (v) = (x - y) km/hr According to question, Speed downstream = distance/time (x + y) = (50 × 2)/5 (x + y) = 20……………(i) Speed upstream = distance/time (x - y) = 50/10 (x - y) = 5…………………..(ii) Now, speed of boat in still water = (u + v)/2 km/hr ∴ Speed of boat in still water = (20 + 5)/2 km/hr = 25/2 km/hr = 12.5 km/hr
What is the monthly wage ceiling specified under Section 4(1) for working out the maximum amount of compensation, after the amendment made in 1995?
If ‘DREAM’ can be coded as ‘NBFSE’ how can ‘GUIDE’ be coded?
Find the compound interest on ₹11,000 in 2 years at 4% p.a., interest compounded yearly.
According to the India State Forest Report 2021, which state has shown the highest increase in forest cover?
What is true for phylum echinodermata ?
Consider the following statements regarding the 24th Constitutional Amendment Act:
1. It excluded the Constitutional Amendment from the purview o...
In 1870, who among the following formed the Puna sarvjanik sabha ?
Bagh Caves paintings situated in Madhya Pradesh are related to which of the following dynasty?
Planets do not twinkle because:
A boy goes to school with a speed of 65 km/h and comes back with a speed of 35 km/h. find his average speed?
Relevant for Exams:
