Question
The downstream speed of a boat is 8 km/hr more than its
upstream speed and the ratio of the speed of the boat in still water to the speed of the stream is 11:4. Find the total time taken by boat to travel 60 km downstream and 42 km upstream?Solution
Let the speed of boat in still water be x km/hr and that of stream be y km/hr. ATQ, ⇒ (x + y) – (x – y) = 8 ⇒ y = 4 km/hr ⇒ x = 4 × 11/4 = 11 km/hr Required time = [60/(11+4)] + [42/(11−4)] = 10 hr
Evaluate: (768÷16)×(125÷25)−(81÷9)×12
[(4/3) + (5/6)] of 378 = ?
What will come in the place of question mark (?) in the given expression?Â
48 ÷ 4 × (3 + 5) – 6² + 10 = ?
What value should come in place of the question mark (?) in the following question?
1250 − ( 320 + 180 ) × ...
(360 - ?)/(25% of 96) = 13
What value will come in place of (?) question mark in the given expression.
3³ + 4² × 5 – 28 = ?
What value should come in the place of (?) in the following questions?
53 × 12 + 43 × 13= ? × 7 - 12% of 1300
2*1/3 + 22*1/3 + 222*1/3 + 2222*1/2 + 22222*1/2 = ?
Solve for the ?
(5832)1/3  × 10.11 × 11.97 ÷ 16.32 = ? + 45.022
