A bus shuttles between two neigbouring towns every two hours. It starts from 8 AM in the morning and the last trip is at 6 PM. On one day the driver observed that the first trip had 30 passengers and each subsequent trip had one passenger less than the previous trip. How many passengers travelled on that day?
The number of trips made by the driver on particular day are 5 ( 8-10, 10-12, 12-2, 2-4, 4-6)
Number of passenger keeps on decreasing with each trip so total passengers carried on that day
= 30 + 29 + 28 + 27 + 26
= 140
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