5. The ratio between the speeds of two trains is 7: 8. If the second train runs 400 kms. in 5
hours, the speed of the first train is
(a) 10 Km/hr
(b) 50 Km/hr
(c) 70 Km/hr (d) none of these
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Step-by-step explanation:
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Answer:
(c)70 Km/hr
Step-by-step explanation:
Let the speed of the first train be x.
The distance traveled by the second train=400 kms.
Time taken = 5 hrs.
Speed of the second train= distance/time
= 400/5= 80 km/hr.
The ratio of the speed of the two trains=
x/80= 7/8
x= 7/8 × 80 = 7×10= 70.
Hence, the speed of the second train is 70 km/hr.
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