A boat travelling downstream travels at a speed which is 25% faster than it travels in water that is still. Determine how long it takes the boat to travel 135 km both upstream and downstream assuming it can go 216 km upstream and 180 km downstream in 12 hours.
ATQ, Let's assume the boat travels at "4y" km/h in still water. Boat speed downstream = 1.25 × 4y = 5y km/h Stream speed equals 5y – 4y = y km/h. Boat speed upstream is equal to 4y – y = 3y km/h. ATQ, 216/3x + 180/5x = 12 Or, 72/x + 36/x = 12 Or, x = (72 + 36)/12 = 9 Boat speed downstream is 5 × 9 = 45 km/h. Boat speed upstream is equal to 3 × 9 = 27 km/h. (135/27) + (135/45) = 5 + 3 = 8 hours is the desired time.
In a group of five children (K, L, O, M, N) with different heights. K is the tallest while L. is the shortest. O is the second shortest person in that g...
Which figure will replace the question mark (?) in the following figures series?
Statements:
Some ceilings are beds.
No bed is an apple.
All dogs are beds.
Conclusions:
I. Some ceilings being do...
Select the letter cluster that will come next in the following series.
CHD, EJF, ______
Select the option that is related to the third number in the same way as the second number is related to the first number.
576:384 ∷ 765: ?
There are six boxes, namely P, Q, R, S, T, U, which are kept one above the other. R is kept immediately above P. T is kept immediately above U. Only two...
Select the set in which the numbers are related in the same way as are the numbers of the following sets.
(NOTE: Operations should be performed o...
Which number will replace the question mark (?) in the following series?
6, 20, 42, ?, 110, 156
Find the wrong number in the following number series:
10, 17, 26, 36, 50
Select the option that is related to the third term in the same way as the second term is related to the first term and the sixth term is related to th...
