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What is the correct answer?
4
A man complete a journey in 10 hours. He travels first half of the journey at the rate of 21 km/hr and second half at the rate of 24 km/hr. Find the total journey in km.
A.
220 km
B.
224 km
C.
230 km
D.
234 km
Correct Answer :
B. 224 km
(
1
/
2
)
x
21
+
(
1
/
2
)
x
24
=
10
⇒
x
21
+
x
24
=
20
⇒
15
x
=
168
x
20
⇒
x
=
168
x
20
15
=
224
k
m
.
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