Question

Six trains run from Bangalore to Chennai every week. The train numbers are 151, 152, 153, 154, 155 & 156. Train No: 151 runs on all days except Monday and Wednesday. Train no: 152 runs on all days except Tuesday and Thursday. Train no: 153 runs on all the days on which 152 doesn’t run. Train no: 154 runs along with 152 except Monday and Saturday. Train no: 155 runs on all the days on which 154 doesn’t run except Tuesday and Thursday. Train no: 156 runs alternately the whole week starting from Monday. If a person has to go to Chennai two days a week, which two days should he/she choose to have highest frequency of trains on those days?

• A. Monday and Wednesday
• B. Friday and Sunday
• C. Tuesday and Saturday
• D. Thursday and Sunday

Answer 1

The correct option is B Friday and Sunday

The train time table is as follows:
$\begin{array}{ccc}\text{Days of the week}& \text{Trains running on the day}& \text{Frequency of trains}\\ Monday& 152,155,156& 3\\ Tuesday& 151,153& 2\\ Wednesday& 152,154,156& 3\\ Thursday& 151,153& 2\\ Friday& 151,152,154,156& 4\\ Saturday& 151,152,155& 3\\ Sunday& 151,152,154,156& 4\end{array}$
Clearly, from the table, we can conclude that the best two days for the journey will be Friday and Sunday.