Discussion

Explanation:

Let time travelled by bike = t hours, hence time travelled by car = 10 - t hours

Total distance travelled = t × 15 + (10 - t) × 25 = 200

⇒ -10t + 250 = 200

⇒ t = 5 hours.

∴ Distance travelled by bike = 5 × 15 = 75 kms and distance travelled by car = 200 - 75 = 125 kms

Ratio of distance travelled by bike and car = 75 : 125 = 3 : 5

Hence, option (a).

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