Question
What is the wavelength of light having frequency 6 ×
10¹⁴ Hz? (Speed of light = 3 × 10⁸ m/s)Solution
If 10 men can complete a piece of work in 12 days by working 7 hours a day, then in how many days can 14 men do the same work by working 6 hours a day?
Numan does half as much work as Gagan in four-fifth of the time. If together they take 16 days to complete a work, how much time shall Gagan take to do it?
Sanjay and Amit can do a piece of work in 8 days. Amit alone can do it in 12 days. In how many days will Sanjay do it alone?
A and B can do a certain work in 6 hours, and A, B and C together take 4 hours to do the same. How long will it take for C alone to accomplish the task?
A and B can finish a work working on alternate days in 19 days, when A works on the 1st day. Similarly, they can finish the work working on alternate da...
A can finish the work in 40 days and B in 30 days. They both work together for 5 days and then B leaves. How many days will A take to complete the remai...
Working together A and B can do a job in 40 days, B and C in 36 days and all three together in 24 days. In how many days can B alone do the job?
P, Q and R can complete a work in 10 days. 20 days and 30 days, respectively, working alone. How soon can the work be completed if P is assisted by Q an...
A can do a piece of work in 15 days while B can do it in 18 days. Starting with A, they work on alternate days till the work gets over. How many days i...
A car is moving at a uniform speed of 35 km/h. What is the time it takes to cover 140 km?
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