Answer :

Solution 1 :

Time taken by train to cover 51 km is 45 min

Time taken to cover 1 km = 45 / 51 km

Time taken to cover 221 km = ( 45 / 51) * 221 = 195 min

Therefore the train takes 3 hours and 15 min to cover 221km.

Solution 2:

Time taken by train to cover 51km = 45min

So, 17km = 15min

Then, 221/17 = 13

13 * 15 = 195min

195min = 3hrs. 15min

Time taken by train into cover 51km =45 minutes

Time taken by train into cover 1km =45 /51 minutes

Time taken by train into cover 1km =45*221 /51 minutes

= 15*13

=195minutes

=3 hours 15vl minutes

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