**Share It On : **

**Time & distance**

**To convert from**

**km/hr to m/sec = Multiply by 𝟓/𝟏𝟖 **

**A km/hr = A x 5/18 m/s **

**To convert from**

**m/sec to Km/hr = Multiply by 𝟏𝟖/𝟓**

**B m/ s = B x 18/ 5km/hr **

**If a car covers a certain distance at A kmph and an equal distance at B kmph,****the average Speed of the whole journey =**

**2AB / A+B**

**Speed and time are inversely proportional (when distance> is constant)**

**If the ratio of the speeds of A and B is**

**a : b, **

**Then the ratio of the times taken by them to cover the same distance is**

**b : a**

**1. In a race of 200 metres, Y can give a start of 10 metres to X, and Z can give a start of 20 metres to Y. The start that Z can give to X, in the same race, is**

**(a) 30 m**

**(b) 25 m**

**(c) 29 m**

**(d) 27 m**

**2. A BUS, 240 m long crosses a man walking along the line in opposite direction at the rate of 3 kmph in 10 seconds. The speed of the BUS is**

**(a) 63 kmph **

**(b) 75 kmph **

**(d) 83.4 kmph**

**(d) 86.4 kmph**

**3. A train 300 metres long is running at a speed of 25 metres per second. It will cross a RAILWAY bridge of 200 metres in**

**(a) 5 seconds **

**(b) 10 seconds **

**(c) 20 seconds **

**(d) 25 seconds**

**4. A CAR moving at a speed of 45 km/hr overtakes a BUS 150 metres ahead going in the same direction in 30 seconds. The speed of the BUS is**

**(a) 27 km/hr **

**(b) 24 km/hr **

**(c) 25 km/hr **

**(d) 28 km/hr**

**5. A BOY crosses a road 250 metres wide in 75 seconds. His speed in km/hr is:**

**(a) 10 **

**(b) 12 **

**(c) 12.5 **

**(d) 15**

**ANSWERS**

**1.C**

**2. C**

**3. C**

**4. A**

**5. B**

Read More