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He 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?
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He ratio between the speeds of two trains is 7 : 8. If the second trai...
Given:

  • Ratio of speeds of two trains = 7:8

  • Distance covered by second train = 400 km

  • Time taken by second train = 5 hours



To find: Speed of first train

Solution:

  • Step 1: Let the speed of the first train be 7x km/hr and the speed of the second train be 8x km/hr (according to the given ratio)

  • Step 2: Speed = Distance/Time

  • Step 3: Speed of the second train = 400/5 = 80 km/hr

  • Step 4: Substitute the values in the equation for the second train's speed


8x = 80

x = 10



  • Step 5: Substitute the value of x in the equation for the first train's speed


Speed of first train = 7x = 7(10) = 70 km/hr


Therefore, the speed of the first train is 70 km/hr.
Community Answer
He ratio between the speeds of two trains is 7 : 8. If the second trai...
70km/ hr
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He 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?
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