Question
The ratio of the speed of boats ‘A’ and ‘B’ in
still water is 8:9, respectively. The speed of the current is 25% of the speed of boat ‘A’ in still water. If boat ‘A’ takes 9 hours to travel 810 km downstream, then find the time taken by boat ‘B’ to travel 252 km upstream and 792 km downstream. (Note: Both the boats are rowing in the same stream.)Solution
Let the speeds of boats ‘A’ and ‘B’ in still water be 8x km/hr and 9x km/hr Therefore, speed of the current = 0.25 × 8x = 2x km/hr According to the question, 8x + 2x = 810/9 Or, 10x = 90 Or, x = 9 Therefore, upstream speed of boat ‘B’ = 9x – 2x = 7x = 63 km/hr Downstream speed of boat ‘B’ = 9x + 2x = 11x = 99 km/hr Required time taken = (252/63) + (792/99) = 4 + 8 = 12 hours
(115.25 + 324.78) ÷ 4.99 = ?2 – 56.44
`[(sqrt(750) xx15.981) -: 54.003]` `xx` ? = 6997.81001
25.19% of (?2 ÷ 38.87 × 4679.94) = 6299.82 ÷ 419.78 × 50.15
?2 - 12.5% of 647.99 = 24.98% × 363.97 + 5% of 1059.98
What will come in the place of question mark (?) in the given expression?
?2 = {40% of (552 – 352 )} – 44
Amit and Bheem can individually finish a task in 10 days and 15 days, respectively. If they work together to complete the task an...
(752.09 - 43.04 x 7.94) ÷ 16.9 = ?
25.902 × 78.095 + 999.996% of 200.08 + 20.005 % of 7999.997 = ? × 15.008 × 33.009
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exactvalue.)
