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Downstream speed = Distance/Time = 30/2 = 15 km/h. Upstream speed = Distance/Time = 30/3 = 10 km/h. Let speed of the boat in still water be x and speed of the current be y. Then, x + y = 15, x - y = 10. Adding both equations: 2x = 25 → x = 12.5 km/h. Answer: c) 12.5 km/h.
A can do a job in 24 days, while B can do the same job in 30 days. They started the work together, but A left after 6 days. In how many more days will B...
A goods train and a passenger trains are running on parallel tracks in the same direction.The driver of the goods train observes that the passenger tra...
Ajay and Bharti are initially 493 km apart. They start jogging towards each other with speeds of 36 km/h and 64 km/h, respectively, at the same time. If...
‘A’ and ‘B’ started moving towards each other at same time with a speed of 20 km/hr and 15 km/hr, respectively. If the di...
If 'P' reduces his speed by 40% of his original speed, he arrives at his destination 3 hours later than usual. How much time would he take to reach his ...
A bus covers a certain distance without stopping at an average speed of 50 km/h. But when it covers the distance intermittently. So its average speed is...
A man covered 40 km by bus and rest 25 km on foot. If the speed of the bus is 150% more than that of the man and the whole distance is covered in 2 hour...
Train P starts from Lucknow to Dehradun at 11:55 am with an average speed of 30 m/s. Train Q starts from Dehradunto Lucknowat 1:35 pm with an average sp...
Identify the cases where two objects moving in opposite directions have a relative speed of 30 km/h.
