M4maths Previous Puzzles

24 Jul 2019 Distance Traveled

Pappu and Gappu are 180 km apart they start to move towards each other simultaneously, Pappu at speed 20 km/hr and Gappu at 10 km/hr if every hour they double their speed what is distance that Pappu will travel until he meets Gappu

OPtion

1) 64
2) 60
3) 75
4) 80
5) 100
6) 110
7) 130
8) 120
9) 140
10) None of these

Solution

In 2 hours Pappu covers (20+40) = 60 km
Gappu covers( 10 + 20) = 30 km,
Total covered = 90

In the next hour they have to cover (180 - 90) kms with the speeds 80km/hr and 40 km/hr respectively.

Let them take another t hrs to meet
so sum of the distance to be covered by both is 90 km
(80*t) + (40*t) = 90km
=> t= (3/4) hrs
we need to find out the distance covered by Pappu
which equals to = 60 + (80*(3/4)) = 120 km

Correct Option: 8 Best Solution (0)