**Concept-The question tests on the fundamentals of Rate(Speed/Time) Solution: **

Distance = Speed x Time

Length of the bridge = Distance covered

=> Length of the bridge = 12 * (7/10) km

= 7/5 km

=1 2/5 km

**(option b)**

Modified on: Tue, 12 Oct, 2021 at 12:37 PM

**Concept-The question tests on the fundamentals of Rate(Speed/Time) Solution: **

Distance = Speed x Time

Length of the bridge = Distance covered

=> Length of the bridge = 12 * (7/10) km

= 7/5 km

=1 2/5 km

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