Question
The speed of boat 'X' in upstream is 18 km/hr and speed
of boat 'Y' in downstream is 30 km/hr. If the difference between speeds of boat 'X' and 'Y' in still water is 20 km/hr, then find the time taken by boat 'X' to cover 210 kilometres in downstream. (Note: speed of boat 'X' in still water is more than that of boat 'Y' and both boats are travelling in same river)Solution
ATQ,
Let speed of boat 'X' in still water be 'x' km/hr Therefore, speed of boat 'Y' in still water = (x - 20) km/hr According to the question, (x - y) = 18 ...... (I) And, (x - 20) + y = 30 Or, (x + y) = 50 ...... (II) Adding equation (I) and (II), we get 2x = 68 Or, 'x' = (68 / 2) = 34 Putting value of 'x' in equation (I), we get 'y' = 16 Therefore, downstream speed of boat 'X' = 34 + 16 = 50 km/hr Required time taken = (210 / 50) = 4.2 hours
Guava flesh pink spot variety also known as sardar
What is the budget allocated for the “PM Formalisation of Micro food processing Enterprises (PMFME) Scheme” over five years?
The process by which nutrients, chemicals or contaminants are dissolved and carried away by water, or are moved into a lower layer of soil is:
A wheat crop grown on two hectare area produced 10 ton grain and required 5 irrigations of 6 cm each, find out its field water use efficiency
It is the practice of forestry in areas devoid of tree growth and other vegetation situated in places away from the conventional forest areas with the o...
Cows’ stomach has four different compartments to it, which one is the known as true stomach ?
At temperatures above freezing, activities of food borne microorganisms can be:
Which of the following is used to reduce the phytotoxicity of herbicide?
In Banana, Which nutrient is given in largest amount through fertigation?
The following is not a characteristic of land
Relevant for Exams:
