Question
The speed of a boat in still water is 12 times the speed
of the stream. If the difference between the upstream and downstream speed of the boats is 20 km/hr, then find the time taken by the boat to travel 220 km in upstream.Solution
Let the speed of the stream be ‘x’ km/hr Therefore, speed of the boat in still water = 12x km/hr Upstream speed of the boat = 12x – x = 11x km/hr Downstream speed of the boat = x + 12x = 13x km/hr According to the question, 13x – 11x = 20 => 2x = 20 => x = 10 Therefore, upstream speed of the boat = 11x = 110 km/hr Required time taken = 220/110 = 2 hours
Determine the simplified value of the given mathematical expression.
((8)0- (0.1)-1)/( (6/16)-1 ×(3/2)3+ ((-2)/6)-1) = ?/2
(22% of 1500 + 15% of 2200) = ? x 11
Simplify the given expression:
[(2.3)3 + (15.9) ³ + (3.7) ³ – 3 × 2.3 × 15.9 x 3.7)] / [(2.3) ² + (15.9) ² + (3.7) ² – 2.3 ...
What is the place value of 6 in 367892141?
(21 × 51 + 81)/(9 × 14 - 30) = ?
10% of 100 + 14 = ?% of 120
24% of 400 × 16% of ? = 384
- What will come in place of the question mark (?) in the following questions?
25% of 360+40=?
Relevant for Exams:
