Question
If a man rides a bicycle at a speed of 50 km/h for 2
hours and at a speed of 40 km/h for the next 4 hours then what will be the average speed?Solution
Given: Time = 2 hours & Speed = 50 km/h Distance = Speed × Time = 50 × 2 = 100 km Time = 4 hours & Speed = 40 km/h Distance = Speed × Time = 40 × 4 = 160 km Total Distance = 100 km + 160 km = 260 km Total Time = 2 hours + 4 hours = 6 hours Average Speed = Total Distance / Total Time = 260 km / 6 hours = 43.33 km/h
Komal and Seema individually can complete a task in ‘4a’ hours and ‘6a’ hours respectively. If they together can complete half of the work in 6 ...
P alone can finish a piece of work ‘M’ in 5 days while Q takes 3 days to finish it alone. P, Q and R working together can finish the work ‘N’ wh...
‘A’ and ‘B’ can do a piece of work in 10 days and 20 days, respectively. They started working together but ‘A’ left after 3 days. Find the t...
16 men or 24 women can complete a piece of work in 36 days. A man and a woman together complete the work and receive a total wage of Rs. 9,600. Find the...
- 8 men working for 5 hours a day can complete a work in 28 days. If 16 women are employed to work, then find how many hours a day they have to work to compl...
Person ‘R’ can complete a task in 60 days, and together with ‘S’, they can do it in 24 days. If ‘S’ worked alone for 18 days and then left, ...
Ram can do a work in 60 days while Mohan can do the same in 84 days. If Ram work for 'x' days while Mohan work for ' x + 2' days then one-third of the w...
A can complete a work in 10 days and B can complete the same work in 15 days. They work together for some days, then A leaves. B finishes the remaining ...
A, B and C can mow a field in 36 days, 72 days and 54 days respectively. All the three began the work together on January 1, 2016, but A left 8 ...
Ram can do a piece of work in 12 days and Shyam can do the same work in 16 days. They both started work together, Ram left 2 days before the completion ...
