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 7.5 hours to travel 750 km downstream, then find the time taken by boat ‘B’ to travel 210 km upstream and 330 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 = 750/7.5 Or, 10x = 100 Or, x = 10 Therefore, upstream speed of boat ‘B’ = 9x – 2x = 7x = 70 km/hr Downstream speed of boat ‘B’ = 9x + 2x = 11x = 110 km/hr Required time taken = (210/70) + (330/110) = 3 + 3 = 6 hours
Select the most appropriate option to substitute the bold segment in the given sentence. If there is no need to substitute it, select ‘No substitution...
Select the most appropriate synonym of the given word.
ENIGMATIC
Select the most appropriate SYNONYM of the given word.
Disrupt
Select the most appropriate option that can substitute the underlined words in the given sentence.
The art of growing plants in water wit...
Select the most appropriate option to substitute the underlined segment in the given sentence. If no substitution is required, select No improvement
...The supreme court’s sole (A)/soul (B) woman judge asked whether the much-touted gender justice will continue to remain only on paper.
There...
Amid allegations (A) of corruption, compromises (B) on safety and other issues, some of the key officials in the team were shifted out to insufficient ...
Select the most appropriate option to substitute the underlined segment in the given sentence. If there is no need to substitute it, select ‘No substi...
Find the appropriate meaning of the underlined idiom.
Value education should be a part and parcel of any education system.
...Select the most appropriate option to substitute the underlined segment in the given sentence. If no substitution is required, select ‘No substitu...
Relevant for Exams:
