Question
Speed of a boat in still water is 3 times more than the
speed of stream. If boat covers 135 km in downstream in 9 hours, then find the time taken by the boat to cover 108 km in upstream.Solution
Let the speed of stream be βxβ km/hr. So, speed of boat in still water = 4 Γ x = 4x km/hr Downstream speed of boat = 4x + x = 5x km/hr According to question; 5x = 135/9 = 15 Or, x = 3 Upstream speed of the boat = 4x β x = 3x = 3 Γ 3 = 9 km/hr Required time taken = 108/9 = 12 hours
2*1/3 + 22*1/3 + 222*1/3 + 2222*1/2 + 22222*1/2 = ?
(8.6 Γ 8.6 + 4.8 Γ 4.8 + 17.2 Γ 4.8) Γ· (8.62 β 4.82 ) = ? Γ· 19
30 of 20 - 40 + 182 - 23 Γ ? = 83Β
672 ÷ 28 × 24 + 363 – 309 =?
162 Γ· [51 β {29 β (9 β 6Μ Μ +Μ Μ 7Μ )}]=?
108² + 99 X 98² =?
...Find the Value of β(-β3+β(3+8β(7+4β3)))?Β
Train M, βxβ metres long crosses (x β 30) metres long platform in 22 seconds while train N having the length (x + 30) metres crosses the same plat...
Simplify the following expression:
Β Β (525 +175) Β² - (525 β 175) Β² / (525 Γ 175)
What will come in the place of question mark (?) in the given expression?
(17/27) of 162 + ?Β² = 632 - (73 - 12) X 5
Relevant for Exams:
