The downstream speed of a boat is 4 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 5:2. Find the total time taken by boat to travel 42 km downstream and 30 km upstream?
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) = 4 ⇒ y = 2 km/hr ⇒ x = 2 × 5/2 = 5 km/hr Required time = [42/(5+2)] + [30/(5−2)] = 16 hr
A takes 32 days to complete a work while B can complete the same work in 12 days less than A. If C can complete 25% of the work in 12 days, then find th...
A and B can complete a work together in 30 days. If A alone can complete one-third of the work in ‘x’ days and remaining work is completed b...
A can do a work in 45 days and the same the work is done in 15 days by A and B together, then in how many days B can complete the 20% of work?
Asmita and Bhanu working together can complete the task in ____ days, and the efficiency of Sam is 50% more than that of Asmita. Bhanu alone can complet...
Vijay can do a piece of work in 32 days and Sanjay can do the same work in 48 days. If Vijay works for 2 days and got Rs. 960, and the remaining work wi...
55 men can complete a piece of work in 18 days. ‘x’ men started the work and after 9 days 64 more men joined them so that whole work was finished in...
A and B working together completed a job in 40/9 days. If A had worked twice as efficiently as she did and B had worked 1/3 of his actual efficiency, th...
P alone can finish a piece of work ‘M’ in 8 days while Q takes 4 days to finish it alone. P, Q and R working together can finish the work &l...
A and B alone can complete a work in 20 and 30 days, respectively. 50% of the work is completed by C in 5x days, and the remaining work is completed by ...
P and Q together can do a piece of work in 30 days, Q and R together can do it in 20 days. P starts the work and works on it for 5 days, then Q takes it...
