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What is the correct answer?
4
A car travelling with
5
7
of its actual speed covers 42 km in 1 hr 40 min 48 sec. Find the actual speed of the car.
A.
17
6
7
km/hr
B.
25 km/hr
C.
30 km/hr
D.
35 km/hr
Correct Answer :
D. 35 km/hr
Time taken = 1 hr 40 min 48 sec =
1
h
r
40
4
5
m
i
n
=
1
51
75
h
r
s
=
126
75
h
r
s
.
Let the actual speed be x km/hr.
Then,
5
7
x
×
126
75
=
42
⇒
x
=
42
×
7
×
75
5
×
126
=
35
k
m
/
h
r
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