A driver of truck sees an ambulance 160 meters ahead of him. After 20 seconds the ambulance is 140 meters behind. If the speed of the truck is 80 kmp/h, then what is the speed of the ambulance?

Relative speed = (total distance )/(total time ) = (160+140)/20 = 15 m/sec Speed in km/hr = 15 × 18/5 = 54 km/hr Relative speed = speed of truck – speed of bike 54 = 80 – speed of ambulance Speed of ambulance = 80 – 54 = 26km/hr

- Train P starts from Lucknow to Dehradun at 11:55 am with an average speed of 27.5 m/s. Train Q starts from Dehradunto Lucknowat 1:35 pm with an average speed of 22.5 m/s. At what time the two trains will meet each other if the distance between Lucknowand Dehradunis 615 Km.
- X started to run from point ‘A’ to ‘B’ at a speed of 32 km/hr at 9:00 am and Y started to run from point ‘B’ to ‘A’ at a speed of 16 km/hr at 11:00 am. If they meet each other at 3:00 pm then find the distance between points ‘A’ and ‘B’.
- An Aeroplane flies along a Square field @ 50, 100, 200 and 400 km/hours respectively. Then find the Average speed of the aeroplane during the whole journey?
- A boy goes to his school at 1/6th of the speed at which he returns from his school. Average speed during the whole trip (i.e. one round) is 24 km/h. What is the speed of the boy while he was going to his school?
- X started to run from point ‘A’ to ‘B’ at a speed of 21 km/hr at 9:00 am and Y started to run from point ‘B’ to ‘A’ at a speed of 18 km/hr at 11:00 am. If they meet each other at 3:00 pm then find the distance between points ‘A’ and ‘B’.
- The speed of two cars A and B are in the ratio of 15:19 respectively. Car A travels 16 km less than the car B in the same time duration. What was the distance (in km) travelled by the car B during that time?
- 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.
- Saket and Rakesh are brothers whose shops are located at a distance of 10km and 12km respectively from their home. Both of them start at the same time from home every day and reach their respective shops exactly at 8 am. When they decided to swap shops for a day, Saket started 4 minutes earlier than Rakesh. If both of them reached on time, what is the speed of Rakesh?
- Harsh and Dev planned to meet each other. Dev starts to travel from point A to B at the speed of 42 kmph at 10:00 AM and Harsh starts from point B to A at the speed of 28 kmph at 12:00 PM. If they meet at 2: 30 PM, find the distance between A and B.
- Excluding the Stoppages i.e. Non-stop, the speed of a Bullet train is 810 km/h and including the stoppages, it is 720 km/h. calculate for how many minutes does the bullet train stop per hour.

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