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Trains Boats and Streams Practice Test 4 with solutions
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© examsnet.com
Question : 1
Total: 40
A motorist covers a distance of 39 km in 45 minutes, by moving at a speed of x km/hr for the first 15 minutes, then moving at double the speed for the next 20 minutes and then again moving at his original speed for the rest of journey. Then x is equal to :
31.2
36
40
52
Validate
Solution:
Here, x ×
15
]
60
+
2
x
×
20
60
+
x
×
10
60
= 39
⇒ 3x + 8x + 2x = 39 ×
60
5
⇒ 13x = 39 × 12
∴ x =
39
×
12
13
= 36
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