612 Rahul Travels. 450 km an
m by train. He then travel i
Date...
totul ?
. And
Answers
Answer:
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Explanation:
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Explanation:
Let the speed of train =x km/hr
The speed of car =y km/hr
∵ time = distance/speed
According to the 1st condition
Time taken to cover 120 km by train + time taken to cover
480 km by car =8 hrs
⇒
x
120
+
y
480
=8 ....(1)
According to the 2
nd
condition, we have
Time taken to cover 200 km by train + time taken to cover 400 km by car =8 hrs 20 min
⇒
x
200
+
y
400
=
3
25
....(2)
[8 hrs 20 min =(8+
3
20
)hrs=
3
25
]
Multiply equation (1) by 200 and equation (2) by 120 and subtract both.
⇒(
x
24000
+
y
96000
=1600)−(
x
24000
+
y
48000
=1000)
⇒
y
48000
=600
⇒y=80
Put y=80 in equation (1),
⇒
x
120
+
80
480
=8
⇒
x
120
=2
⇒x=60
Hence, the speed of train =60 km/hr.
The speed of car =80 km/hr.