Question

The ratio between the speeds of two trains is 7: 8. If the second train travels 400 km in 5 hours, then the
taken by the first train to travel 420 km is-
a) 7 hours
b) 6 hours
c) 10 hours
d) 8 hours​

Answer 1

Answer:

Question

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The ratio between the speeds of two trains is 7:8. If the second train runs 400km in 4 hours, then the speed of the first tra

Correct option is

D

87.5kmph

Step-by-step explanation:

Answer 2

Let The First Train be 'A' and The Second Train be 'B'

Ratio of A : B = 7 : 8

Distance Travelled By B = 400 km

Time Taken By B = 5 h

Speed = D

T

= 400 km

5 h

= 80 km / h

•°• A : 80 = 7 : 8

A = 7

80 8

A = 7 × 80 = 7 × 10

8 = 70

•°• A = 70 km / h

According To The Question :

Time Taken By A To Travel 420 km :

T = 420 km = 6 h

70 km

h

•°• ANSWER IS OPTION B) 6 HOURS