Here’s and example of a **SMART MATH** problem for **TIME SPEED DISTANCE.**

**Problem**

**Problem**

If I walk to my office at 6 km/hr, I arrive 6 minutes early. If however, I walk at 4 km/hr, I arrive 4 minutes late. What is the distance that I walk to reach the office?

- 2 kms
- 2.5 kms
- 3 kms
- 4 kms
- 6 kms

**The Usual Method**

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Let the usual time taken to reach office be ‘*t*’ hours and distance be ‘4’ kms.

Hence, hours and hours

kms

**(Ans: 1)**

*Estimated Time to arrive at the answer = 45 seconds.*

**Using Technique**

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At 6 km/hr it takes th of an hour to travel 1 km

At 4 km/hr it takes th of an hour to travel 1 km

Hence, time difference is hour = 5 minutes.

Actual difference in time = 10 minutes.

If difference in time = 5 minutes for 1 km,

For difference in time = 10 minutes, distance = 2 kms

**(Ans: 1)**

*Estimated Time to arrive at the answer = 15 seconds.*

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## One reply on “[Smart Math] Time Speed Distance Problem 7”

Very good!!

Good site for children!