Question

Sharad covers two-third of a certain distance at 4km/hr and remaining at 5km/hr. If he takes 42 minutes in all, then what is the total distance

Answer 1

let sarad covers x distance

now according to question
distance covered by 4km/h is 2/3x and 1/3x distance covered by 5km/h
we also know time=speed /distance
use this concept

4/(2x/3) +5/(x/3)=42/60 {because time given 42min , convert it hour I.e. 42/60hour}
=> 6/x+15/x=7/10
=> 21/x=7/10
=> x=30km

Answer 2

Answer:3 km

Step-by-step explanation:

Spèed 1= 4kmph

Distance 1= 2x/3

Speed 2= 5kmph

Distance 2= x/3

Time = Distance/Time

Total time 42min

2x/3 /4 + x/3 /5 = 42/60

x/6 + x/15 =42/60

7x/30 =42/60

x = 42/60 x 30/7

x =3km

Please mark as brainliest