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