Question
P’s 4 days work is equal to Q’s 5 days work. If P
and Q together can complete the work in 20 days then how much time Q will take to complete 40% of the work?Solution
Ratio of efficiency of P and Q = 5:4 Let the efficiency of P and Q be 5x and 4x units per day respectively. Total work = 9x × 20 = 180x units Required time = (0.40 × 180x)/4x = 18 days
- Two cars, ‘X’ and ‘Y’, started from town ‘M’ and ‘N’ respectively towards each other at the same time. When they crossed paths after 6 hour...
- A car was driven for 2.5 hours at a speed of 100 km/h and then for 1.5 hours at a speed of 80 km/h. Find the car's average speed for the total journey.
The ratio of the speed of car to that of a train is 15:22. If the speed of the train is 35 Km/hr more than that of the car, what is the speed of the car?
A car travels from town P to town Q at 60 km/h and returns from Q to P at 40 km/h. What is the average speed for the whole journey?
A train completes a journey in 5 hrs with a speed of 50 km/hr. At what speed must it travel to complete the journey in 5 hrs?
A train would take 20 seconds to cross a stationary pole. If the train was 200m shorter, it would have taken 10 seconds less. Find the speed of the train.
- Rohit jogs at a pace of 14 km/h and takes 11 hours for his fitness trail. What speed does he need to jog at to finish it in just 7 hours?
A person travels 30 km at a speed of 15 km/h, another 20 km at 10 km/h, and the final 50 km at 25 km/h. What is the average speed for the entire journey?
- A truck covers the distance from Depot A to Depot B at 30 km/h and returns at 45 km/h. Find its average speed.
Average speed of ‘A’ during a 20-hour journey is 32 km/h. If he covered the first 240 km of his journey at a speed of 20 km/h, then find the speed a...
