## Time, Speed and Distance

#### Time and speed shortcuts-Part 1

Basics:

Speed = Distance / Time

Time = Distance / Speed

Distance = Speed * Time

For conversion of Km/hr to m/sec and as well as m/sec to km/hr

- For km/hr to m/sec = we need multiply with 5/18
- For m/sec to km/hr = we need multiply with 18/5

If u need clear info about conversion you can comment below

Ex:-

**1. A person crosses a 600 m long street in 5 minutes. what is his speed in km/hr?**

**Ans:**

**D= 600m**

T= 5min

S=? in km/hr

In this, we can’t do the direct calculation because speed in meters and Time in minutes so we need to convert anyone either speed into km or Time into sec or hr

- Time = 5*60

= 300sec

- Speed=Distance/Time

= 600/5

= 120

= 2 m/s

But this is not answer for the above question this is the mistake that most of the people doing in exams

Because it is m/sec but we need km/hr so we need to convert it.

km/hr= 2*(18/5)

= 72km/hr

**2. If a person walks at 14 km/hr instead of 10km /hr, he would have walked 20km more. The actual distance traveled by him is?**

**Ans:**

**For the speed at 10 km/hr the assume distance D and as well as at 14 km/hr he would be walked 20km more So D2=D+20**

** Given Data :**** D =D**** T =T**** D2= D+20**** Here time for the both speeds are same so we can use the formula**** **

** (D/S1)=((D+20)/S2)**** by solving above 7D=5D+100**** 7D-5D=100 => 2D=100**** Distance D= 100/2 => 50km**

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