due to insufficient data in today's puzzle (14 Aug) we are going to cancel the today's puzzle and th

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14 Aug 2014 Canceled puzzle

due to insufficient data in today's puzzle (14 Aug) we are going to cancel the today's puzzle and this week we will ask the puzzle till Saturday.
sorry for inconvenience

A picnic bus starts at 8 am with constant speed 40 km/hr for 3 hours. The picnic place is at a distance of 120 km. The whole route is a straight path. After some travelling rain start due to which the driver decreases the speed to 20 km/hr upto the time of raining. When rain fall stops he increases his speed to 1.5 times & reach the destination at time. What will be the duration of rain.

OPtion

1) 34
2) 25/3
3) 50/3
4) 10/3
5) 10
6) 20/3
7) 12/5
8) 17/5
9) 28
10)None of these

Solution

By the given condition
x + y = 70 (i)
x/40 + y/20 + (120-x-y)/60 = 3
x/40 + y/20 - x/60 - y/60 = 1
x/120 + y/30 = 1 (ii)
solve

50/3
Option 3)

Correct Option: 3 Best Solution (0)