m/s to km/hr conversion.

Rarely Tested

While converting the speed in m/s to km/hr, multiply it by 3.6. It is because 1 m/s = 3.6 km/hr

Question 1

Ram and Shyam start running simultaneously from the same point on a circular track of length 1000 metres and are running at 36 Km/hr and 45 Km/hr. Find the minimum time after which they meet at the starting point?

Question 2

A train of length 250 m crosses a lamppost in 10 seconds. What should be the increase in the speed of the train so that it can cover a distance of 1350 km in 10 hours?

Question 3

On a 20 km tunnel, connecting two cities A and B, there are three gutters (1, 2 and 3). The distance between gutters 1 and 2 is half the distance between gutters 2 and 3. The distance from city A to its nearest gutter, gutter 1, is equal to the distance of city B from gutter 3. On a particular day, the hospital in city A receives information that an accident has happened at gutter 3. The victim can be saved only if an operation is started within 40 min. An ambulance started from city A at 30 km/hr and crossed gutter 1 after 5 min. If the driver had doubled the speed after that, what is the maximum amount of time would the doctor get to attend to the patient at the hospital.

Assume that a total of 1 min is elapsed for taking the patient into and out of the ambulance?