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Speed, Time and Distance - Quant/Math - CAT 2009
Question 4 the day:
April 22, 2003
The question for the day is from the topic of Speed, Time and Distance.
- The speed of a motor boat itself is 20 km/h and the rate of flow of the river is 4 km/h. Moving with the stream the boat went 120 km. What distance will the boat cover during the same time going against the stream?
| (1) |
80 km |
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(2) |
180 km |
| (3) |
60 km |
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(4) |
100 km |
Correct Answer - (1)
Solution:
Let the distance to be covered by the boat when it is travelling against the stream be x.
The boat goes down the river at a speed of 20 + 4 = 24 km/h and up the river at a speed of 20 – 4 = 16 km/h.
Since the time taken is same 120/24 = x/16
Therefore, x = 80 km.
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