Question
The ratio of the speed of boat in upstream to speed of
boat in downstream is 7:9. If the boat can cover a total of 119 km upstream and 162 km downstream in 7 hours, then find the time taken by the boat to cover 180 km in still water.Solution
Let speed of boat in upstream and downstream be â7xâ km/h and â9xâ km/h respectively. 119/7x + 162/9x = 7 17/x + 18/x = 7 35 = 7x x = 5 Speed of boat in still water = (7x + 9x)/2 = 8x = 8 Ă 5 = 40 km/h Desired time = 180/40 = 4.5 hours
Which of the following numbers is divisible by 11?
Amit has 7 friends whom he wishes to invite to a dinner. Out of his 7 friends, 1 or more may accept the invitation. In how many diïŹerent ways can Amit...
Who among the following ministry is implementing âSwadhar Grehaâ?
In relation to the Production Linked Incentive Scheme for electronics, consider the following statements:
1. It is an outcome and growth-based ...
In Excel _____function returns the remainder of two numbers after division.
In India, if a religious sect/community is given âthe status of a national minority, what special advantages is it entitled to?
1. It can estab...
Which of the following organism doesnât have the internal digestive process?
The polling of by-elections in some constituencies was cancelled in 2016, in which of the following States of India?
Which of the following pairs is not correctly matched?
Who was the militant peasant leader of Bihar?
