On a `120 km` track , a train travels the first `30 km` at a uniform speed of ` 30 km//h`. How fast
Channel: Doubtnut
Date: 2020-07-26

On a `120 km` track , a train travels the first `30 km` at a uniform speed of ` 30 km//h`. How fast must the train travel the next `90 km` so as to average `60 km//h` for the entire trip?